Do you want to produce an object for your audience? How about 12 times?
The magician shows an empty frame to the spectators. Putting his hand into the frame, he then pulls out a very nice aquarium, filled with paper flowers, to everyone's surprise. Then, he makes a second one appear! He is not at all finished - in total, he can make 12 aquariums appear!!
12 Flower boxes ("aquariums") from an empty frame!! Looks amazing!