This is a woodworking project that was inspired by the cover of the excellent book Gödel, Escher, Bach.  The idea is to make a shape which is the intersection of three block letters, such that its profile is a different letter from each of three axes.

I've done this twice now, and to make a proper one you may need to as well. I'll explain why in a minute, but if you'd like to try your hand you'll need:
  • Wood (I've made little ones out of packing styrofoam and a pocket knife as well, though)
  • A bandsaw
  • Sandpaper
  • Acrylic paint/sealer (optional)
Depending on which letters you want to make, you may also need:
  • A drill press
  • A coping saw

Step 1: Cut a Cube

You'll want to start with a cubic blank of wood. If you don't have one, you can easily make one with any cutting power tool and a stopper block. Say you want to cut a 2" cube. Set up a piece of wood on your machine so that 2" of it will be chopped off, and then clamp something up against it in that position. Make the cut, rotate the resulting piece and cut it again. Once more, and you'll have cut the wood to exactly the same length along all three axes. A cube!
Great job! I've had this on my to-do list for some time (I read most of G-E-B and it blew my mind).
Soo Cool!
I want to try that
Oh this is pretty neat!
I need to make this
Wow, super cool project! It reminds me of the Playstation symbol.
I've seen this done with 3d software and printing, but it's cool to see it done by eye and hand.

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