1952 exhibition at the Sidney Janis Gallery in New York City Pollock showed Number 12, 1952, a large, masterful stain painting that resembles a brightly colored stained landscape (with an overlay of broadly dripped dark paint); the painting was acquired from the exhibition by Nelson Rockefeller for his personal collection. In 1960 the painting was severely damaged by fire in the Governors Mansion in Albany that also severely damaged an Arshile Gorky painting and several other works in the Rockefeller collection. However, by 1999 it had been restored and was installed in Empire State Plaza. While Arshile Gorky is considered to be one of the founding fathers of abstract expressionism and a surrealist, he was also one of the first painters of the New York School who used the technique of "staining". Gorky created broad fields of vivid, open, unbroken color that he used in his many of his paintings as grounds. In Gorky's most effective and accomplished paintings between the years 1941 and 1948, he consistently used intense stained fields of color, often letting the paint run and drip, under and around his familiar lexicon of organic and biomorphic shapes and delicate lines. Another abstract expressionist whose works in the 1940s call to mind the stain paintings of the 1960s and the 1970s is James Brooks. Brooks frequently used stain as a technique in his paintings from the late 1940s. Brooks began diluting his oil paint in order to have fluid colors with which to pour and drip and stain into the mostly raw canvas that he used. These works often combined calligraphy and abstract shapes. During the final three decades of his career, Sam Francis' style of large-scale bright abstract expressionism was closely associated with color field painting. His paintings straddled both camps within the abstract expressionist rubric, action painting and color field painting. Having seen Pollock's 1951 paintings of thinned black oil paint stained into raw canvas, Helen Frankenthaler began to produce stain paintings in varied oil colors on raw canvas in 1952. Her most famous painting from that period is Mountains and Sea (as seen below). She is one of the originators of the color field movement that emerged in the late 1950s. Frankenthaler also studied with Hans Hofmann. Hofmann's paintings are a symphony of color as seen in The Gate, 1959–1960. Hofmann was renowned not only as an artist but also as a teacher of