Back and forth … I’d love to have the $95 German made version of this trick, but who can afford it these days? Well, here’s a large size cardboard version that works just fine! Open the red box and remove the black box. See Cade holding both. Then open the black box and put the red box fully inside the black one. Wait! That’s impossible. Open the black box again, take the red out. Close the black. Open the red. Put the black box back inside the red. That’s still impossible! You can repeat this several times, even pulling sponge balls or silks out of either of the boxes. Lots more you can do with it.