Rob from What Is It? provided me a follow up to the Magnifying Glass Optical Illusion post. Rob included the below picture and this explanation.
If you put a magnifying glass a few inches from a wall that is opposite a window, you will see the outside view projected upside down on the wall. But if you put a lens on the window and cover the rest of the window with opaque material, the lens will project the outside view over the entire opposite wall, of course you must have the proper size lens for the room.
This is a picture that Rob took after conducting his lens experiment. You can see the view outside his room is projected on the wall. If you would like to do this for yourself follow the instructions on this site.
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