Pinhole Cameras.

Pinhole Cameras can be made in a variety of sizes. Doing some research, I found a few that I thought were really creative. Here are a few..

This last one actually has 6 lenses! I thought that was really interesting. It demonstrates a level of skill and creativity that I think most people don't think about when they're considering making a pinhole camera, given that they're usually so simple. It has a variable focal length and produces four 2 1/4 x 7 inch pictures.