Kind of a natural "pinhole camera"... someone who doesn't have a convenient tree can punch a little hole in a sheet of plastic/cardboard/foil, and put a blank white sheet of paper behind it to see the sun projected onto it.
Kind of a natural "pinhole camera"... someone who doesn't have a convenient tree can punch a little hole in a sheet of plastic/cardboard/foil, and put a blank white sheet of paper behind it to see the sun projected onto it.
Kind of a natural "pinhole camera"... someone who doesn't have a convenient tree can punch a little hole in a sheet of plastic/cardboard/foil, and put a blank white sheet of paper behind it to see the sun projected onto it.