Here are some links for building a camera obscura. Check them out and bring materials to class so we can build them.
http://www.youtube.com/watch?v=Y0wenfVfHuo
Make a room into a camera obscura
http://camera-obscura.co.uk/camera_obscura/camera_make.asp
http://www.pinholephotography.org/camera%20obscurer.htm
http://thecreatorsproject.vice.com/blog/make-your-own-camera-obscura-instructables-how-to
https://diy.org/skills/photographer/challenges/171/make-a-camera-obscura
Digital Camera Obscura from MIT CSAIL
A Fun piece about the camera obscura in San Fransico
http://books.google.com/books?id=S0gEAAAAMBAJ&pg=PA9&source=gbs_toc_r&cad=1#v=onepage&q&f=false
https://www.youtube.com/watch?v=3RKfwVJuTpQ&nohtml5=False
Here is proof my camera obscura works