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Cut a piece of black paper or foam that’s the length of the triangular prism tube and wide enough to wrap around it completely, with a little overlap. Glue or tape this black backing around the tube to create the mirrors.
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Measure and cut the pencil to the length of the prism tube plus enough to let the eraser hang over the edge. You can cut through the pencil with an X-Acto, a utility knife, or a small saw. Make sure the cut end is smooth.
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Use electrical, cloth, or foam tape to tape the pencil tightly to the middle of one of the flat sides of the tube, running parallel along the outside.
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Glue beads and treasures to the yogurt lid with craft glue. Allow the glue to dry overnight. It will dry clear, so don’t be stingy; make sure everything is glued securely.
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Stick the pushpin or thumbtack through the center of the decorated lid and anchor it into the middle of the pencil eraser.
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That’s it. Spin the disk and look through the tube to a beautiful image! Making this kaleidoscope unlocks the principles of how the instrument works. Learn more about all things kaleidoscopic at http://www.brewstersociety.com.