Plaster of Paris can be used in art, architecture, fireproofing, and medical applications. POP (Plaster of Paris) can also be used in designing the interior of a house for making the various patterns on the wall as well as on the roof.POP is made up of Gypsum. Gypsum is exposed to a very high temperature to create Calcium Sulfate and then grinded to form a fine white powder. When water is added to that powder, a slurry is formed that can be molded in a variety of ways and turned out into a solid shape when get dry. This is how POP is used.