In Light, young Olive and her cousin, Troy, learn all about the properties of light with the help of a visiting inventor and a room full of his crystal trophies. They discover that light behaves in different ways to change the way we see things. When light waves hit something, three things can happen: the light can bounce, it can pass through or it can be absorbed. Troy, Olive and the inventor also examine a variety of devices, which use lenses to bend light and help us see images correctly, such as telescopes, periscopes and binoculars.