"A Saturday morning cartoon is the colloquial term
for the animated television programming that has
typically been scheduled on Saturday mornings
on the major American television networks from
the 1960s to the present…." —Wikipedia

Martin Gardner in the Notices of the
American Mathematical Society 
,
June/July 2005:

“I did a column in Scientific American 
on minimal art, and I reproduced one of
Ed Rinehart’s [sic ] black paintings. 
Of course, it was just a solid square of
pure black.”

Black square 256x256

Click on picture for details.

For a cartoon graveyard

IMAGE- LA Times obits for two Saturday Night Live writers