(Skt. skandha, Tib. phung po nga) Literally, "heaps." These are the five basic transformations that perceptions undergo when an object is perceived. First is form, which includes all sounds, smells, etc., everything that is not thought. The second and third are sensations (pleasant and unpleasant, etc.) and their identification. Fourth are mental events, which actually include the second and third aggregates. The fifth is ordinary consciousness, such as the sensory and mental consciousnesses.