This image was done by printing the water tower 3 times, in 3 different colors.
Half the images are upside down, like the Mexican cards they came from.
I collected these images from all over. The figure in the lower left invented litter and is demonstrating how to pour it.
Big screen print. Each version has completely different colors.
Here's an example of the water tower print by itself.
I based this image on a tiny ad in the New Yorker advertising French berets. All the info on it is tongue in cheek.
Stuck for an idea, looking around the room, I spotted this chair. Again, each print is in different colors, including one that will burn your retinas.