I was about to sit here and write a five paragraph dissertation on the deep meaning of Unbearable Pain, but then I realized when you look away, the painting changes. I like the painting Theme Relation though, a bit of self-deprecating wit.
The one about the walking dog though made me think it would be neat if the shapes followed the outline and movement of someone walking a dog when you moved, but if you stopped moving it just looked like any other piece of abstract art.