Showed this to my photography students. Then I sent them in my storage room/closet and had it set up as a Camera Obscura. There's a large window in there, so I had already covered it with black plastic trash bags and had a dime-size hole cut in it. It worked beautifully. Kids were excited about it. After a couple days the top fell down, so unless another taller teacher helps me out again, it's staying down.