This is using the Gestalt principle where we are using positive and negative space. The negative space of the coffee cup is actually a person talking and the top of the coffee cup comes out to be a thought bubble.
Bender Photo Collage - x canvas with blocks of Glue pictures on with Elmers glue leaving a small border between. I nailed the canvas to wall behind random pictures to keep it smooth. We bought "primed" molding to frame it and nailed to wall.