Dieter Roth

Dieter Roth, (from) Stupidogramme (gesammelte werke band 9) [Stupidograms (collected works volume 9)], 1975

Dieter Roth, Collected Works, Volume 9, 1975, Unique Cover

François Morellet

Random Distribution of 40,000 Squares Using the Odd and Even Numbers of a Telephone Directory, 1960

Vera Molnar

Structures of Squares, 1974 at V&A - link

Untitled (14), 1977 up on Artsy - link