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seven-symmetry | by Bill Ward's Brickpile
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A technique for building 7-way radial symmetry in LEGO. The blue 2x2 plates are connected to each other using plate hinges in a ring, and when I built that I noticed the ring looked like the right diameter to go around a 4x4 round piece. The hinges actually protrude a little into the center, but by sandwiching the two 4x4 rounds together and filling the space inside with a round 2x2 plate and seven (leaving one stud open) 1x1 round plates, you can make it all fit nicely. And since the 4x4 rounds and 2x2 round plate have axle holes, it can easily be connected to any Technic mechanism.

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Uploaded on June 7, 2010