Answer/Explanation:
colorful semi-transparent stuff, foil, a tube, and clear tape.
put the foil inside but not on a roll, make it into a shape like triangle or hexagon. Put a layer of clear tape on one end of the tube and then cover it with the semi-transparent stuff and sandwich it in with more tape. put tape on the other end and limit the amount you see to a small hole.
You will see down the tube to the colorful stuff but the foil will (hopefully) reflect the colors to make the weird look of a Kaleidoscope.
The light coming through the colorful stuff is bouncing off the foil at a right angle from side to side until it hits the pinhole and goes into the eye where the cone cells in our eye and we see the colorful tube of fun.