You Light Up My Life . ... We will learn about how light travels by using mirrors, prisms, and shadow makers. ... You can usually still see things in the shadow because there is other light scattered or bounced about the room or yard hitting that area indirectly. ... Outside, the Sun lights up the world. ... Most will say that the Sun is shining and hitting the object on one side of it, and the shadow forms because the light can't get through to the other side of the object, so there's no light there. ...