Homemade kaleidoscope toy

The kaleidoscope is one of those toys that make me nostalgic for my childhood. Today, just before children go back to school, I'd like to show how to make a homemade kaleidoscope toy. On the photo above you can see samples of what's seen through the kaleidoscope I've built with my kids. Each pattern is enclosed in a black circle because of the way I photographed them. In reality though, you should see continuous patterns throughout the field of view.