A small, fine interlude that makes your magic interesting and varied. You need a magic wand for your next trick. Perhaps you'll lecture on the fact that a magic wand, if it is to develop its full magic power, must be black. You reach into the magic box and pull out a red wand (approx. 28 cm long)! You notice the mistake, run your hand over the wand once without covering it, and it visibly changes into a black wand. Your hands are empty at the beginning and at the end, absolutely child's play to perform! You can transform the wand as often as you like, i.e. from red to black, back to red etc. without preparation.
Therefore also great for children's performances: You take a red wand out of your pocket and claim that you want to perform a trick with your black wand. The children notice the lapse and shout, "That's red!" You run your hand over it the wand turns, black, you say, "All right, then I'll show a trick with a red wand!". The professional realises the potential of such a sequence alone!