We love this simple, self-working and very deceptive puzzle. You show a picture of a fish that runs across three cards.
The cards are mixed so they are obviously out of order and it looks like a "fishy fish".

You turn the cards face down, snap your fingers and when they are turned face up the fish is reassembled as it was before the mixing!

If you are not familiar with the principle involved, you will be fooled the first time you see it. It might even confuse you when performing...

You receive the three postcards and access to an online video instruction.