Place a red, a white, and a blue block into the tube, in that order. Then tip the tube to let the blocks out the other end- and they come out in a different order- the red one is now in the middle! You can even have the spectator put the blocks in the tube, and still the blocks will change places! Finally, you can put two blocks into the tube, put the third one in your pocket, and instantly all three blocks are in the tube!
Best of all, this one couldn't be any simpler to do, even for very young magicians. If you can put the blocks into the tube, you can do this trick!
Comes complete with blocks, tube and printed instructions.