Gestalt psych incorporates images that mentally trace a triangular figure. Apperception is a branch of Gestalt in that things are essentially made up of discrete and separate deceptions. The process unites various sensations and perceptions which occur from experiences.
This process is a "bottom-up" approach, building up information. Democritus was said to have coined the term, as he saw order and function of atoms as being the smallest unit that can't be divisible.