In 1971, after he had finished founding New York magazine and before he created the "I [Heart] N Y" logo, Milton Glaser designed Puzzle Cube, a set of 64 op arty, acrylic blocks, as a "Museum of Modern Art multiple."
I have no idea what that means, whether they were a limited edition of some kind, or just a MoMA-produced tchotchke. Either way, I'd like to see some. Actually, what I'd like to see is some nice wooden ones with non-toxic paint, but first things first.
Milton Glaser Puzzle Cube, via Design journal archive, issue 271 [ahds.ac.uk]