Nor is it tolerable to be stopped by a mere apostrophe to form the correct possessive form of the noun.
Clyfford Still (1904-1980) – Painter and leader of the Abstract Expressionist movement. Jackson Pollock is perhaps the more well-known name from this movement in which painting looked, to some critics anyway, like a chaotic, sloppy mess thrown haphazardly onto a large canvas.
What would be the photographic equivalent of abstract expressionism?