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Wedgits - http://wedgits.com/
Wedge shaped building blocks construction set. Includes design ideas and worldwide list of dealers.
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Astro-logix - http://www.astro-logix.com/
Create complex and beautiful fractal stars and 3D geometric shapes.
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Gridblox - http://www.aptitude-testing.com/gridblox.htm
Cubical wooden blocks with notched corners that interlock by gravity.
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