McCloud surmises that most blotter art was created so manufacturers, dealers, and imbibers could identify the origins of the acid in their possession.

Seen here as a balloon in the 2010 Macy's Thanksgiving Day Parade, SpongeBob SquarePants — or a costume purporting to be same — got into some trouble with the police yesterday.

The “blotter art” is a throwbacks to the 1960s and 70s. Back then, dealer sold the color sheets laced with LSD, commonly known as acid.