simple cube projected on the corner of my room. When you walk around, you have the illusion that the cube follow you. (Polymorphic vs anamorphic).
You can try this at home if you have a beamer. You must find the right angle to match the red lines with the corner of your room. Distance has no importance.
Here is the final image (right click -save as)
TΣTRΛGRΛMMΛTON PROJΣCT 