Shapeways community member Robert Carlsen pointed me to the work of Robert Bosco. Bosco was an amazing "turner" an artist & artisan that using a mechanical lathe makes the most amazing things out of wood. To illustrate what is possible with 3D printing we usually point to examples such as "a ball in a ball" or other impossible shapes. But, Bosco has managed to create impossible shapes by hand and by using a lathe. The intricacy, sheer work & skill as well as the planning that goes into these things is incredible. Take some time to check out the site here where he has stars inside polhedra, Stars inside Dodecahedra and something called openwork stapled spheres that blew my mind.