"Rainbow in your hand" is a flip-book created by the Japanese designer Masashi Kawamura.

This is a small pocket book with 36 black pages and an image with a color spectrum that, when flipped quickly, creates the illusion of a three dimensional rainbow on your hand.

This book can be acquired on the site of utrecht, but I doubt you can make the order unless you have a less rusty Japanese than I have.

You can always try Polite Cards that on the moment I'm writing this, has the item sold out or the Heeza in France that sells this little funny book for 11 Euros.

This is a great and original gift for any of your friends. A Rainbow!