These are my imagined undersea
creatures, mathematically designed based on hyperbolic
These are not
naturally occurring sand dollars.
If someday I am reincarnated as a sand
dollar in a parallel universe,
these are my fantasy echinerdermata mates.
These are made of nylon, by selective
Each is circular, about 6 inches in diameter and a quarter inch thick.
This and the next are made of ABS by fused deposition modeling. The
above is 8 inches across.
This is four inches across. There is a
paper describing the
mathematical ideas here
Copyright 2007, George W. Hart