The mystery of Brainstring Original isn't just how to untie a twisted 'knot' of strings in the centre, but how it can be that all its strings can be interchanged - WITHOUT creating a knot! Four groups of different coloured strings, four strings per group, moving up, down and around all six sides of a polycarbonate shell... beyond just tying or untying a knot, what kind of beautiful symmetries can you create? Brainstring Original isn't just a puzzle - it's a work of art.
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