It would have to be either Salvador Dali or Marc chagall. My favorite of their works. For Dali ot would have to be The disentigration of the Persistence of memory. Chagall, the newspaper seller. i did a recreation of that one for art class. Its a beautiful piece.
So for everyone who has listed Dali, have you all seen his older work, before he started his surrealism he was an abstract painter in the vein of Picasso.