Magic with Light. The trick is simple, the effect astounding: you photograph or film a scene. Then you project the image or film back onto the original scene from exactly the same location. Now comes the trick: if you hold an object in front of it, it appears transparent. Academically this is called "optical camouflage" and at the... . Hey - you always learn new tricks. Thanks to Industrial Technology & Witchcraft for this link. Found at Industrial Technology & Witchcraft.