It started out small. Well, to be fair, it still is quite little: much smaller than a typical book, and far more simple in both design and concept as well. Now a viral sensation, this book has been covered in other books – not to mention magazines, newspapers and TV shows.

What does it do? Well, unlike an ordinary flip-book filled with pictures that become an animation when you page through them quickly, this neat piece of work generates a rainbow for you … it is thus aptly titled Rainbow in Your Hand.

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Why such a splash? Perhaps it is tied to the elemental joy of experiencing a rainbow on command. Maybe this tiny book’s big popularity is tied to the way it reorients our view of books (both flip-books and standard volumes). Either way, this cute little read packs a real neat punch.