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A Rubik's Cube for the Blind

Rubik's Cube

You can design a Rubik's Cube with Braille letters to signify colors. Doing so, howevever, presents a problem:

But when you turn a braille letter upside down, it becomes a different braille letter. So as the user rotates the cube it becomes impossible to read the colors.

Brian Doom solved that problem by giving a cube six distinct textures, each of which represents a color.

Link -via Smart News