I saw the Julio Le Parc 1959 exhibit at The Met Breuer two days before it closed, and it was (arguably) the best (abstract minimalist) exhibit that I've viewed.
What initially appeared to be patternless pieces, upon closer inspection, were discovered to be creatively and painstakingly patterned in clean colors or in black or white.
|Quantitative Sequences [Séquences Quantitatives]|
For example, in Quantitative Sequences [Séquences Quantitatives], Le Parc started with an empty square and filled it and emptied it, one block at a time, until the end of the piece.
And in Mutation of Forms [Mutación de Formas], Le Parc opened and closed a red and blue "umbrella" from the beginning to the end of the gouache on cardboard piece.