Impossible Geometry by Nicolás Basbous Merlo - Video Download Bill Goldman you will find 3 Shuffle

you will find 3 Shuffle Variations in full detailed explanation and 3 Magic Effects that have been specially designed to teach and understand the uses and the interesting applications of each variation

and these are a case study example

Color of peas may very between red and white

The spectator tells you

Impossible Geometry by Nicolás Basbous Merlo - Video Download Bill Goldman you will find 3 ShuffleEffect: The magician presents a playing card, which has a triangular hole. This "hole" is transformed into a squared hole. After another magical pass, the square hole transforms into a circular hole in a very visual way. The card is shown on both sides. The only effect that changes from TRIANGLE to SQUARE and then to CIRCLE : two DIFFERENT changes, three DIFFERENTS shapes. NOT need black background. Changes are made in the center of the playing card.