The shape that has its own world record but that no one thought could exist.
Try Brilliant for yourself at https://brilliant.org/tibees

SURFER program: https://imaginary.org/program/surfer
Barth Sextic 3D printed sculpture: https://imaginary.org/hands-on/four-m…
The Golden Ratio: https://en.wikipedia.org/wiki/Golden_…%5B…%5D