Get your Quaker Oatmeal boxes taped up, grab some film, and get out there and explore the world through primitive camera obscura! I've got a couple of pinhole cameras at the ready. In case you don't, here are a few links with more information on how to do it:
http://www.pinholeday.org/
http://www.merrillphoto.com/pintoidhowto.htm
http://www.scphoto.com/html/pinhole.html