Instructions: Find a dark site (very dark) with clear skies and no manmade lights. Be there at sunset. You'll see Venus glaring in the southern sky: diagram. When the sky fades to black, turn your back on Venus (otherwise it will spoil your night vision). Hold your hand in front of a white screen—e.g., a piece of paper, a portable white board, a white T-shirt stretched over a rock—and let the shadow materialize.
If anyone gets a photo of that, drop me an e-mail with a copy, please.