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cat litter gray blue pink crystals close-up texture pattern background abstract shapes geometric 3d dimensional depth perspective illusion op art visual art abstract art non-objective art geometric abstraction hard-edge painting minimalism Bauhaus De Stijl Neo-Plasticism Piet Mondrian Theo van Doesburg Gerrit Rietveld Bauhaus Dessau Weimar Bauhaus Black Mountain College Josef Albers Max Bill Richard Paul Lohse Victor Vasarely Bridget Riley Frank Stella Kenneth Noland Jules Olitski Robert Ryman Agnes Martin Ad Reinhardt Ellsworth Kelly Al Held