Square Circle Card Transformation (FT)

Two cards. One with a circle cutout, one with a square. They switch places! How?

Created by Ian Adair here is a Passe Passe type effect using two playing cards, with a difference. The cards are the same, but each with a big hole in their centers - one square and one circular! The performer explains that often squares change places with circles and vice-versa, and offers to prove this point. The card with the circular hole is placed inside the performers trouser or jacket pocket. After a snap of the fingers, it is seen that both cards have magically changed places.

Both cards can be examined at the commencement of the effect. Complete with special cards and instructions.