Yin and Yang
These two enantiomorphous orbs are made of walnut and basswood (7" diameter).
The pair is titled Yin and Yang, but I don't know which is which. The
bases are made from stainless steel wire and some kind of stone I picked
up in a river once. They are completely hollow (and very light weight)
being made of 1/8 inch thick boards, cut and beveled to meet precisely.
As the image shows, they are mirror images of each other. Each has
the property that if you switch light and dark regions, they remain unchanged.
And if you promise not to like them any less, I will mention that they also
illustrate an interesting theorem that certain topological operators commute.
This paper gives some
background about the geometry.
copyright 1999, George W. Hart