[flickr video=http://www.flickr.com/photos/camil_t/2456826781/]

When light enters a dark room through a small hole, it projects the reverse image of the scene outside the room. Creating a Camera Obscura.

Photos and video from mauricio asial, Rodrigo Perez, and camil tulcan.
For more images like this check out some of the groups related to Camera Obscura.