Looking for the sig with the meme: There are four logs. No, there are three.

[huge_brass_balls]

Someone, I forgot who, has a signature with a meme about two people looking
at an object that's impossible to exist in 3D space from two different angles.
One person sees 4 logs and the other sees 3.

This meme perfectly describes how two different people can look at the same object and see
two different things. I would like to show this image in a discussion about perception.

Thanks