Guess My Shape . Understanding how light hits things of different shape and form necessitates an understanding of shape and form. ... Vocabulary words which can be introduced to help us talk about our experiences are shapes, edges, sides, cylinder, sphere, triangular solid, rectangular solid, cone, pyramid, and cube. ... Pulling shapes through a third dimension means that light shining on these shapes can fool the eye when looking at their shadows. ... What do shadows of these shapes look like? ...