This is an image of some of my students with an image of the ASU parking lot on the back wall of the classroom; my students and I created the image by blacking out the windows with cardboard and then cutting a 2 inch circular hole in the middle to let in light. The image is inverted, so I have rotated this photo to show the parking lot right side up. (Check out the light poles to orient yourself.) Here's a drawing Margot did to help explain how this works and why the image is inverted:
More information is available on my Penland Science in the Studios Page.