This is an idea for a “chair test” or “color match” sort of effect. You have four boxes, each with a different colored interior. Then you have four cards with a different color. The cards are mixed up and one is put face down in each box. The colors match the interior of the box they were set in!
Method: Use four card switching boxes.
That’s a simple and direct method that’s 100% surefire!
I think if I were going to do this trick, I would have one more card than I have boxes. That would make opening the last box a bit more dramatic as there could be a failure at that point, instead of it being a known result.
-Louie