It is not clear what magic these canisters are meant to achieve. The curator would welcome any suggestions of possible routines. One possibility is that one of the canisters is plunged into a tub full of confetti and, once filled up with confetti, removed and the lid placed on it. After a magic word, the lid is removed only to find that the confetti has disappeared and the canister is now filled with water. As an applause cue, the water could be poured from the canister into another, visibly proving to the audience that the confetti really has turned into water.