LONDON.- Gagosian Gallery presents an exhibition of new installations, light works, sculptures and prints by James Turrell. This is his first exhibition with the gallery. For more than forty-five years, Turrell has explored the myriad possibilities of using light as a medium of perception. His formally simple works draw attention to the limits of seeing while seeking to expand the wordless thought that they provoke. Throughout these permutations, the light that is normally used to illuminate other things is assigned form and structure, making it the subject of the revelation. Since pursuing studies in perceptual psychology during the 1960s, Turrell has been exploring a variety of perceptual phenomena, ranging from sensory deprivation to intense optical effects. Early works such as Afrum-Proto (1966) and the Mendota Stoppages (1969-1974), which employed planes of light in relation to architecture, became the basis for ongoing