Surfaces46 of 113
Seashell
logarithmic growth, after Moseley, 1838
A shell grows by adding to its mouth without changing shape, so its outline follows an exponential spiral. Here the shell grows a turn and a half, then starts again.
(2(1 − e^(u/6π)) cos u cos²(v/2), …, 1 − e^(u/3π) − sin v + e^(u/6π) sin v)
On mathcurve.com as Coquillage
Drawn as