Engineer and 3D printing enthusiast Mark Fuller has recreated a famous magic trick using a few simple 3D printed parts. Known as the Three Deck Illusion, or Charpentier’s Illusion, named after the French physicist who discovered the phenomenon, the illusion can easily be recreated at home thanks to Fuller’s free, 3D models, and would make for an entertaining and clever way to impress or surprise your friends.

Like most magic tricks, it starts off quite simply. Three identical decks of cards are laid out on a table, and a participant is asked to lift first, all three at once, and then the top deck alone. Surprisingly (for the participant), the top box will appear to weigh more than all three boxes combined—but, they will think, how can that be so, since they all appear to be exactly the same?