Shadows of paper decorations on a wall. The shadows look almost as clear and real as the real paper decorations. Moving the torch around changes the position of the shadows with respect to the paper decorations, creating a different "picture" on the wall.
<a href="//commons.wikimedia.org/wiki/User:Annatsach" title="User:Annatsach">Annatsach</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>