No longer updated!

Thursday, July 10, 2008

Kaleidoscope


You need a highly glazed picture postcard. Cut the edges smooth and divide the writing side along its length into four panels an inch wide. Scratch the lines lightly and bend and stick the card into a triangular tube-shape with the glazed side facing inwards. Both openings are glued up with transparent cellophane. At one end also stick white paper over the cellophane, having previously inserted small snips of coloured cellophane in between, so that they can move easily. A beautiful pattern, which alters on tapping with your finger, appears in the tube.

The three highly glazed surfaces of the bent picture postcard behave like mirrors and multiply the image of the coloured pieces of cellophane. A polished surface reflects better, the flatter the light rays hit it. But since part of the radiation is absorbed into the surface, the image reflected from it is not so clear and bright as with a mirror.

No comments: