This is also a Rubik’s Cube but with a difference. It is a special Rubik’s cube in which none of its faces are colored. In place of six different colors each face has a unique series of bulging dots that needs to be felt in order to solve a jumbled cube of its kind. Made for the blind people, each face with a particular cluster of dots actually represents the color in Braille.
Designed by Konstantin Datz, it is an attempt to let blind people enjoy the fantastic toy.
[source : industrialdesignserved.com]