|
| |
| | Jackson Pollock - Wikipedia, the free encyclopedia |
 | | Pollock's first solo show was held at the Peggy Guggenheim Art of this Century gallery in New York in 1943. | | | Pollock's technique of pouring and dripping paint is thought to be one of the origins of the term Action Painting. | | | Pollock did observe Indian Sand Painting demonstrations at the Museum of Modern Art in the 1940's; he may have also seen Indian sand-painters on his trips to the West, although that is debated. |
|
http://www.wikipedia.org/wiki/Jackson_Pollock
(1519 words)
|
|
| |
| | Online NewsHour: Jackson Pollock -- January 11, 1999 |
| | Pollock's life was marked by both a burning ambition to be a great artist, and real doubt as to what he had achieved. | | | Jackson Pollock, the Abstract Expressionist painter, changed the face of art in America. | | | Pollock abandoned traditional painting techniques -- laying his canvases on the floor, for example, -- and even traditional paint - he often used common enamel house paint which he'd pour out or dribble through a small hole in the can, or fling with a stick. |
|
http://www.pbs.org/newshour/bb/entertainment/jan-june99/pollock_1-11.html
(1717 words)
|
|
| |
| | Jackson Pollock |
| | Pollock's first-hand experience of contemporary mural painting is thought to have sparked his ambition to paint large scale works of his own, although he would not realize that aim until 12 years later. | | | The work she saw in Pollock's studio convinced her of his extraordinary talent, and it was not long before influential members of New York's avant-garde intellegensia began to share her opinion. | | | Pollock's radical breakthrough was accompanied by a period of sobriety lasting two years, during which he created some of his most beautiful masterpieces. |
|
http://naples.cc.sunysb.edu/CAS/pkhouse.nsf/pages/pollock
(1347 words)
|
|
| |
| | Jackson Pollock - Blue Poles: Number 11 1952 |
| | While Jackson Pollock’s untimely death, and the almost mystical intrigue of his abstract paintings, have served to emphasise both the ‘romance’ and ‘heroism’ of the artist& public persona, Pollock’s achievements as a painter cannot be overshadowed. | | | Pollock first exhibited at Guggenheim& ‘Art of this Century’ gallery in 1942. | | | Pollock believed that his abandonment of traditional painting tools (he preferred to use sticks, cooking basters or pour directly from the paint can) and the paintings he produced reflected the realms of unconscious experience but also responded to contemporary life. |
|
http://www.ngv.vic.gov.au/pollock
(934 words)
|
|
| |
| | Jackson Pollock 1956 |
| | Jackson Pollock is an excellent hypertext essay from the WebMuseum that features description of his style, including possible sources of his inspiration; discussion of his role in twentieth-century American art; several paintings; and detailed commentary. | | | Jackson Pollock (1912-56) was the key figure in the postwar development of the Abstract Expressionist movement along with Willem de Kooning (1904-97), Franz Kline (1910-62) and Mark Rothko (1903-1970). | | | There is an image of Jackson Pollock at work, and you can read "Pollock Paints a Picture," an article by Robert Coodnough from Art News (May 1951), or the CNN story, with images, about the opening of an exhibit of Jackson Pollock's sketches at the Met. |
|
http://novaonline.nvcc.vccs.edu/eli/evans/his135/Events/pollock56.htm
(1108 words)
|
|
| |
| | The Metropolitan Museum of Art - Works of Art: Modern Art |
| | Pollock's poured paintings are as visually potent today as they were in the 1950s, when they first shocked the art world. | | | From 1942, when he had his first one-person exhibition at Peggy Guggenheim's Art of This Century gallery in New York, until his death in an automobile crash at age forty-four in 1956, Pollock's volatile art and personality made him a dominant figure in the art world and the press. | | | When he was sixteen, Pollock first studied art at Manual Arts High School in Los Angeles, where he met Philip Guston and Reuben Kadish, two friends who later became artists. |
|
http://www.metmuseum.org/collections/view1.asp?dep=21&full=0&item=57.92
(584 words)
|
|
| |
| | Jackson Pollock |
| | Jackson Pollock was born in Cody, Wyoming and went to the Art Students League. | | | Between 1943 and 1947 Pollock was influenced by surrealim and his paintings became more and more abstract | | | This is painting were a painter drips and splatters paint on to a canvas with using just about every tool at his disposal. |
|
http://abstractart.20m.com/Jackson_Pollock.html
(72 words)
|
|
| |
| | Jackson Pollock -- and True and False Ambition: The Urgent Difference |
| | Jackson Pollock was born in Cody, Wyoming, one of five sons to Stella McClure and LeRoy McCoy Pollock. | | | Jackson Pollock early wanted to be a painter, and as artist he welcomed challenges, set himself new problems. | | | Siegel wrote the definitive essay, "Beauty and Jackson Pollock, Too" which placed the artist in the tradition of painting, with a beautiful respect for the deepest ambition of a person. |
|
http://www.terraingallery.org/Jackson-Pollock-Ambition-DK.html
(2301 words)
|
|
| |
| | Jackson Pollock Now |
| | Pollock was born in Cody, Wyoming, and descended on New York like a she-wolf to devour its art. | | | Pollock began to spill paint, in a muscular dance, on canvases in his barn. | | | Jackson pursued the sounds insect noises and distant car horns—which led him to the radical wealth of jazz. |
|
http://www.ru.org/91pollock.htm
(532 words)
|
|
| |
| | jackson pollock art quotations and facts |
| | Pollock's early paintings were expressionistically realistic and then surrealistic in style. | | | Pollock's career was tragically cut short by his drinking and driving death in an automobile accident. | | | Jackson worked studied under Thomas Hart Benton at the Art Students League in New York from 1929 to 1931. |
|
http://www.artopp.net/pollock.htm
(224 words)
|
|
| |
| | Mark Rothko and Jackson Pollock |
| | Jackson Pollock was representative of "action" or "gesture" painting, in which the artist's process and movements were an important aspect of the end result. | | | Jackson Pollock and Mark Rothko approached the creation of their paintings in different ways. | | | Mark Rothko and Jackson Pollock both developed their painting styles in New York during the 1940s and 1950s. |
|
http://www.albrightknox.org/ArtStart/lPollock.html
(1058 words)
|
|
| |
| | Jackson Pollock - Wikipedia |
| | Mit dieser Technik des Action Painting schuf Pollock komplexe, ineinander verwobene Farbstrukturen, wie in Kathedrale (1947, Museum of Fine Arts, Dallas). | | | Ein Jahr später schließt die Galeristin Peggy Guggenheim mit ihm einen Vertrag und stellt Pollocks Werke aus. | | | Eine Rolle für die Auseinandersetzung mit der indianischen Kunst hat offenbar die Ausstellung „Indian Art of the United States“ im Museum of Modern Art 1941 gespielt. |
|
http://en.wikipedia.org/wiki/de%3AJackson_Pollock
(1011 words)
|
|
| |
| | WebMuseum: Pollock, Jackson: Lavender Mist: Number 1, 1950 |
| | Pollock was the first ``all-over'' painter, pouring paint rather than using brushes and a palette, and abandoning all conventions of a central motif. | | | Pollock has put his hands into paint and placed them at the top right-- an instinctive gesture eerily reminiscent of cave painters who did the same. | | | At the time Pollock was heiled as the greatest American painter, but there are already those who feel his work is not holding up in every respect. |
|
http://www.ibiblio.org/wm/paint/auth/pollock/lavender-mist
(357 words)
|
|
| |
| | Jackson Pollock Biography Information |
| | Pollock, Jackson (1912-1956), American abstract painter, who developed a technique for applying paint by pouring or dripping it onto canvases laid on the floor. | | | Although the press often derided Pollock as a purely impulsive and untrained artist, in reality he used careful calculation to achieve his allover compositions and to avoid emphasizing one area over another. | | | Pollock's work proved remarkably influential on later artists: Color-field painters Helen Frankenthaler and Morris Louis adapted his paint-pouring technique. |
|
http://www.1001prints-posters.com/jackson_pollock.htm
(635 words)
|
|
| |
| | Jackson Pollock |
| | By 1947 Pollock arrived at his signature painting technique, which involved pouring, dripping and flinging paint onto large canvases, creating densely filled works that are often exhilarating in their sense of freedom and blindingly complex as well. | | | Pollock's last years were exploring a variety of new approaches, including brush work, creating surprisingly light, clear colored and almost pretty paintings such as Easter and the Totem. | | | The retrospective includes a re-creation of Pollock's Long Island City studio, dissertations on his various technological aspects, films of the artist painting, and works by his peers. |
|
http://www.culturevulture.net/ArtandArch/Pollack.htm
(461 words)
|
|
| |
| | ArtandCulture Artist: Jackson Pollock |
| | Pollock's technique was as innovative as the paintings to which it gave rise. | | | This fabulous site contains photos of Pollock at work, a short essay on his work process, samples of his paintings, events, galleries that show his work, and much more. | | | This visually pleasing page offers images, a photograph of the artist, a bio, and a thorough timeline of Pollock's life. |
|
http://www.artandculture.com/cgi-bin/WebObjects/ACLive.woa/wa/artist?id=150
(503 words)
|
|
| |
| | Jackson Pollock |
| | Accordingly, Pollock was identified more than any other artist of his generation with the idea of artwork as an extension of the artist's being, since every movement of the artist's hand or arm is recorded in the finished picture. | | | Jackson Pollock: A Catalogue Raisonne of Paintings, Drawings and Other Works Vol. | | | Because the artist's motions were thought to be dictated by the unconscious psyche, the artist is seen to be baring his soul in a heroic gesture. |
|
http://hirshhorn.si.edu/collection/gallery/pollock.html
(1066 words)
|
|
| |
| | Jackson Pollock (1912 - 1956) |
| | Jackson Pollock (January 28, 1912 — August 11, 1956) was an influential American artist and a major force in the abstract expressionism movement. | | | Clement Greenberg (1909-1994) was an influential American art critic who was closely associated with the instituationalization of abstract art in the United States. | | | He was going to be a very famous painter, she promised him. |
|
http://www.jahsonic.com/JacksonPollock.html
(204 words)
|
|
| |
| | Guggenheim Collection - Artist - Pollock - Biography |
| | Pollock’s first solo show was held at Peggy Guggenheim& Art of This Century gallery, New York, in 1943. | | | Although he traveled widely throughout the United States during the 1930s, much of Pollock’s time was spent in New York, where he settled permanently in 1934 and worked on the WPA Federal Art Project from 1935 to 1942. | | | During the early 1940s, he contributed paintings to several exhibitions of Surrealist and abstract art, including Natural, Insane, Surrealist Art at Art of This Century in 1943, and Abstract and Surrealist Art in America, organized by Sidney Janis at the Mortimer Brandt Gallery, New York, in 1944. |
|
http://www.guggenheimcollection.org/site/artist_bio_129.html
(337 words)
|
|
| |
| | Pollock, Jackson : 1912 - 1957 - Abstract Expressionism, painting, drip painting, action painting, Absolutearts.com |
| | In the mid 1950s, Pollock experienced a period of crisis and doubt, which lead to major depression, as a result of the success of his drip paintings.He changed his style to return to traditional brush painting. | | | In Pollock's paintings the elements of intuition and accident play a large and deliberate part, that being one of the major contributions of Abstract Expressionism, which had found its own inspiration in Surrealism's psychic automatism. | | | Pollock's early abstract style is seen in "The She-Wolf" (1943) and "Eyes in the Heat" (1946). |
|
http://www.absolutearts.com/masters/names/Pollock_Jackson.html
(761 words)
|
|
| |
| | Haber's Art Reviews: Jackson Pollock at the Modern |
| | Pollock is painting himself out, bit by bit, along with all the old notion's of art's sublimity. | | | When Pollock paints his fantasies out of his art, painting starts to have a life of its own. | | | After half a century of pattern painting and parody, Pollock's drip paintings can be seen at last as a lot more than drips, but they remain the most defiantly abstract art ever made. |
|
http://www.haberarts.com/pollock.htm
(3073 words)
|
|
| |
| | Amazon.com: Pollock: DVD: Tom Bower,Jennifer Connelly,Bud Cort,Annabelle Gurwitch,Eulala Grace Harden,Marcia Gay ... |
| | Pollock's drinking was an interruption of his art, not a spur to it, and the film can do little to connect the two; we are left with a sombre study of discontent, enlivened by the appearance of Jennifer Connelly as the painter's final girlfriend. | | | As a compassionate but unflinching exploration of Jackson Pollock's intimate world, there's no doubt that Harris captured the essence of a man whose life was as torturous as his art was redeeming. | | | Harden portrays her love for Pollock, her ability to manage his career, and her willingness to subordinate her own career for his, while at the same time revealing a core of iron, a feat which won her an Academy Award. |
|
http://www.amazon.com/exec/obidos/tg/detail/-/B00005KHJJ?v=glance
(2603 words)
|
|
| |
| | Jackson Pollock |
| | In Pollock's art, this is symbolized by the laying bare of the historical process by which each work was created. | | | When Hans Hofmann, that future Abstract Expressionist manqué, suggested Pollock study “nature” from a studio set-up, he replied that he “was Nature.” When a woman asked him how he knew when a poured painting was finished, he asked how she knew when sex was over. | | | His bluntness -- his arrogant disregard of others -- his impatience with anything that did not get to the heart of art or life could be as sharp as a knife -- even if art or life bit back -- and the essential point remained irretrievable. |
|
http://www.artchive.com/artchive/P/pollock.html
(2198 words)
|
|
| |
| | Ivars Peterson's MathTrek - Jackson Pollock's Fractals |
| | The abstract painter Jackson Pollock (1912-1956) is widely known for his spectacular, wall-sized paintings, which typically feature a combination of swirling drips, bright splotches, and bold, rhythmic streaks. | | | Taylor photographed the Pollock painting Blue Poles, Number 11, 1952 (see http://www.kn.pacbell.com/wired/art/pollock.html), which the Australian government had purchased in 1972 for $2 million and put on display at the National Gallery of Australia in Canberra. | | | Physicist Richard P. Taylor of the University of New South Wales in Sydney, Australia, who is also trained as an artist, has taken a mathematical look at Pollock's splatter paintings to try to uncover the secret of their appeal to many viewers. |
|
http://www.maa.org/mathland/mathtrek_9_20_99.html
(675 words)
|
|
| |
| | Marki-Mark`s Pollockpage |
| | Pollock would fix his canvas to the floor and drip paint from a can using a variety of objects to manipulate the paint. | | | In 1944 Pollock married Lee Krasner (1911-84), who was an Abstract Expressionist painter of some distinction, although it was only after her husband's death that she received serious critical recognition. | | | In den 50er Jahren setzte Pollock During the 1950s Pollock continued to produce figurative or quasi-figurative black and white works and delicately modulated paintings in rich impasto as well as the paintings in the new all-over style. |
|
http://www.fh-brandenburg.de/~seeger/pollock.htm
(1124 words)
|
|
| |
| | The Paintings of Jackson Pollock |
| | Jackson Pollock was born in the USA in 1912, he went on to become one of the first abstract painters to be recognised throughout Europe. | | | This resulted in striking paintings, prints of his work are avaiable to buy from AllPosters.com. | | | His painting methods included fixing the canvas to the floor and dropping paint onto it direct from the can, from sticks, from trowels and knives. |
|
http://www.paintingphotos.co.uk/art-prints/jackson-pollock
(101 words)
|
|
| |
| | Jackson Pollock Online |
| | Jackson Pollock at the National Gallery of Art, Washington D.C. Number 1, 1950 (Lavender Mist) | | | Original works by Jackson Pollock available for purchase at art galleries worldwide | | | Report on a Pollock exhibit at the Museum of Modern Art |
|
http://www.artcyclopedia.com/artists/pollock_jackson.html
(619 words)
|
|
| |
| | Jackson Pollock News @ Karr.net (Karr Network) |
| | Byrnes paints her dense, colourful abstracts in a conventional manner, albeit in the vigorous, physical style of Jackson Pollock or Cy Twombly. | | | And, for the past six years, undaunted by his decapitating illness, his accident, and duties, he is painting stunning, Jackson Pollock-inspired art. | | | Williams College Museum of Art Presents 'Jackson Pollock at... |
|
http://www.karr.net/search/news/Jackson_Pollock
(271 words)
|
|
| |
| | Jackson Pollock |
| | Although Hans Namuth was initially reluctant to photograph Jackson Pollock, an artist he considered overrated, he became fascinated by both the man and his art. | | | His unconventional methods—laying his canvas on the floor, walking on it, flinging and drizzling paint as he went—led some to accuse his work of arbitrariness. | | | Namuth followed this first session with more than five hundred photographs of Pollock at work, as well as a short black-and-white film and a color film in which he famously captured Pollock from below, painting on a sheet of glass. |
|
http://www.npg.si.edu/cexh/artnews/pollock.htm
(155 words)
|
|
| |
| | Jackson Pollock |
| | Jackson Pollock - Artist, born 28 January 1912, The abstract painter who splattered his canvasses | | | Jackson Pollock's American Sublime.(Museum of Modern Art, New York, NY) | | | The Master of Drip.(abstract painter Jackson Pollock, Museum of Modern Art, New York, New York) |
|
http://www.infoplease.com/ce6/people/A0839548.html
(395 words)
|
|
| |
| | The Art Institute of Chicago: Art Access |
| | Influential critics viewed Pollock as the leader of a movement which came to be known as American Abstract Expressionism or the New York School and included other painters represented in the Art Institute's collection. | | | In his short life, Pollock created a body of work that helped change the course of Modern art. | | | Pollock's first action paintings appeared around 1947, shortly after the conclusion of World War II. |
|
http://www.artic.edu/artaccess/AA_Modern/pages/MOD_8.shtml
(287 words)
|
|
| |
| | Jackson Pollock on eBay Seller; Art Buyer Tips |
| | Additionally, the painting must be included in the JACKSON POLLOCK CATALOGUE RAISONNE, a massive four-volume-plus-supplement set of books published in 1978 detailing the life and work of this important artist. | | | This proof should include documentation of where the photographer lived, where and when he photographed Pollock, where the photographs are either published or located, and where and under what circumstances he left the painting to the painting to the deceased (he must have really really liked the deceased). | | | Pollock, like many other artists could not pay for such services, As he really never made any money till 1956' -Pollock (Like anyone [seller's parenthetical]) gave this work to (The friend) as a means of payment for services provided, In 1996 (The friend) past away, leaving (The deceased) this original Pollock painting! |
|
http://www.artbusiness.com/eBayhits15.html
(1040 words)
|
|
| |
| | Amazon.co.uk: Jackson Pollock: Books |
| | This book is the catalogue for the retrospective of Pollock's art-shattering oeuvre at the New York Museum of Modern Art in the autumn of 1998 and London's Tate Gallery in the spring of 1999. | | | He arrives at absolutely original conclusions: Pollock's all-over swirls of dripped and flung paint often began as figurative works and clearly relate to such all-American stalwarts as Thomas Hart Benton. | | | It includes many biographical pictures as well as colour plates of Pollock's paintings, from the awkward but earnest early works to the late, great, famous canvases. |
|
http://www.amazon.co.uk/exec/obidos/ASIN/0870700685
(714 words)
|
|
| |
| | MultiVu - Finding Jackson Pollock |
| | Pollock's wife Lee Krasner, also a noted painter, introduced Herbert to Jackson in early 1942. | | | Landau agreed to organize an exhibition and write a catalogue focusing on the artistic and interpersonal relationship between Jackson Pollock, Lee Krasner and Herbert and Mercedes Matter. | | | The new drip paintings will play a key role in the show and their significance in Pollock's career will be fully delineated in a separate publication by Landau. |
|
http://www.prnewswire.com/mnr/zuckerpr/21855
(261 words)
|
|
| |
| | Jackson Pollock Unauthorized |
| | And Jackson Pollock is one such artist who has remained as one of the most influential artists of the past fifty years. | | | This website will take a look at Jackson Pollock prints, his unique style, and his incredible life in a unique and fresh way. | | | And those who did not understand his creations simply brushed Jackson Pollock to the side as another mediocre artist. |
|
http://www.jackson-pollock.com
(269 words)
|
|
| |
| | Jackson Pollock |
| | Jackson Pollock : Works from the Museum of Modern Art, New York, and from European... | | | Jackson Pollock (Getting to Know the World's Greatest Artists) | | | American Art 1908-1947 : From Winslow Homer to Jackson Pollock |
|
http://www.tbook.com/art/p/Jackson_Pollock/index.html
(145 words)
|
|
| |
| | Jackson Pollock |
| | Jackson Pollock and Postwar American Art, New York, Farrar, Straus and Giroux, 1996, 352 S. Ratcliff stellt Pollock etwas grosszügig als Vater der Minimal Art und vieler anderer Künstler dar. | | | Katalog: Kirk Varnedoe, Pepe Karmel, Jackson Pollock, The Museum of Modern Art, New York, 1998, 336 S., 425 Abb. | | | Im Febuar 1944 erschien in Arts and Architecture das erste illustrierte Interview mit Pollock und im Mai erwarb das MoMA The She-Wolf, nachdem im April in Harper's Bazaar der einflussreiche Artikel von James Johnson Sweeney Five American Painters mit einer Farbabbildung eben dieses Gemäldes erschienen war. |
|
http://www.cosmopolis.ch/cosmo1/pollock.htm
(1424 words)
|
|
| |
| | Video- Pollock: Jackson Pollock |
| | This portrait of Pollock combines archival footage of his life and work with reminiscences from his contemporaries | | | His famous "drip paintings" earned him both notoriety and abuse, and the pressures of newfound celebrity compounded his lifelong struggle with alcoholism, a fight he lost when he died in a car crash at the age of 44. | | | One of the mythic figures of the 1950s, the "cowboy" from Wyoming, Jackson Pollock helped to forge the first great American art movement, Abstract Expressionism. |
|
http://www.imageexchange.com/videos/6007.shtml
(101 words)
|
|
| |
| | Artists of the 20th Century - Jackson Pollock DVD |
| | This program examines the life of Jackson Pollock and the social, artistic and political circumstances that led to the unique style he created. | | | 1.33 Born in Wyoming in 1912, Jackson Pollock became one of the most notorious artists that America ever produced. | | | Remember to focus your comments on Artists of the 20th Century - Jackson Pollock DVD. |
|
http://www.cduniverse.com/search/xx/movie/pid/6714109/a/Artists+of+the+20th+Century+%252D+Jackson+Pollock.htm
(340 words)
|
|
| |
| | NGAJackson Pollockartist 1 |
| | Jackson Pollock, 44, bearded shock trooper of modern painting, who spread his canvases on the floor, dribbled paint, sand and broken glass on them, smeared and scratched them, named them with numbers...; at the wheel of his convertible in a side road crack-up near East Hampton, N.Y. --Time Magazine | | | Copyright ©2006 National Gallery of Art, Washington, DC |
|
http://www.nga.gov/feature/pollock/artist1.html
(57 words)
|
|
| |
| | NPR : Jackson Pollock Treasure Found |
| | The small works are all in Pollock's dripped and poured style -- some swirling with vibrant colors, others black and white with tiny flecks of orange. | | | The paintings belonged to photographer, filmmaker and Pollock friend Herbert Matter. | | | The works will go on tour next year, after which Matter's family will donate some of them to museums. |
|
http://www.npr.org/templates/story/story.php?storyId=4647044
(182 words)
|
|
| |
| | Jackson Pollock im COMPUTERGARTEN am 28.Januar |
| | Dieser übte einen starken Einfluss auf Pollock aus, aber auch der mexikanische Wandmaler Orozco beeinflusste seine Malweise. | | | Jackson Pollock war der bekannteste Maler des "Action Painting". | | | Um 1943 verwendet Jackson Pollock bei dem Bild "Hüter des Geheimnisses" in freier Improvisation autographische Zeichen. |
|
http://www.onlinekunst.de/januar/28_01_Pollock_Jackson.htm
(437 words)
|
|
| |
| | Jackson Pollock Posters |
| | Jackson Pollock Art Prints from the place to Buy Art Prints | | | 30-day Return Policy and 100% Satisfaction Guarantee on all Jackson Pollock Posters |
|
http://www.jdhodges.com/posters/jackson-pollock-posters-10108.html
(49 words)
|
|
| |
| | Jackson Pollock |
| | Entre 1943 y 1947 Pollock, influido por el surrealismo, adoptó un estilo más libre y abstracto, como en La loba (1943, Museo de Arte Moderno, Nueva York). | | | Mediante este método Pollock realizó esquemas de formas entrelazadas como se observa en los ejemplos Full fathom five y Lucifer (ambas de 1947, Museo de Arte Moderno, Nueva York). | | | A partir de 1947 Pollock evolucionó hacia el expresionismo abstracto, desarrollando la técnica de la action-painting o dripping, consistente en derramar, dejar gotear o lanzar pintura sobre lienzos sin tensar. |
|
http://www.epdlp.com/pintor.php?id=338
(242 words)
|
|
|
Topic: Jackson Pollock