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Rachel sent me this link to an easy tutorial by Stephanie Lynn on building a large abacus suitable for wall-mounting. I’m pretty sure I’ll never need an abacus, but I gotta admit it looks like fun to build one. It would appear Stephanie is making the beads by cutting slices out of a closet rod and then drilling a hole in the center of each–I say save a step and use a hole-saw for both operations! [via Ohdeedoh]