'Blotter Art' is perhaps one of the strangest and potentially illegal art collections one could get into and here is why: blotters are sheets of paper dipped in a hallucinogenic drug. When torn apart, the sheets become stamp-sized, individual pieces, perfect for that Pink Floyd concert. When left to their original shape and size, they are masterpieces of artistic ingenuity.

The Institue of Illegal Images and collector Mark McCloud own the extensive collection seen above. Blotter Art is a kind of legal grey area, so collect at your own risk.