Peter Eisenman states, " Today, a rock concert might be considered an architectural event..." The rock concert becomes an environment with lights, sounds, and movements. He tries to inform us that concerts are more than just music. Other factors like the lights and people create the complete experience. The same idea is applied to Figure and ground. These are two separate entities with one sitting on another. The fold is a volumetric edge which defines the space by framing the figure, rather than just a straight horizon line.