Peek Book - Without a single book in view

saying inside each envelope is a different colored card: Green

Roll your sleeves up

he also demonstrates how these methods can be adapted to create

Unliftable | Thinking Paradox - (Download) U.F.; DeCourcy Peek Book - Without aUnliftable is a revolution in the concept of the "light and heavy box." Imagine being able to create your own light and heavy boxes for less than $5 and adapt them to almost any object: decks of cards, Rubik's cubes, mobile phones, even transparent objects like glasses and fish tanks! You can always carry your own "light and heavy box" with you, ready to use, and the gimmick is so simple that even a child can make it. It will only take you 2 minutes,