Hob wrote: You got a point there. The ones without the radial ducts (or whatever the right term is) don't have as much 'oompf'. Something to do with the contrast between the ideas of linearity and circularity?
It's a puzzle for sure. You could carve several circles and then cut through them but why end each circle (where the line cuts through them) with a 'wall'? Has the birth canal been suggested before? I'm thinking stages in pregnancy (the circles) with the main feature (the line) indicating the passage from the womb to the world.
I dunno... (how many theories are there now :-)
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