Spiral structures as seen in shells, horns, tusks, teeth, feathers, proboscides, tentacles. (1908) by James Bell Pettigrew, from Design in Nature
.
Source: Cornell University Library / Internet Archive
Available to buy as a print.
https://pdimagearchive.org/images/8e86e367-b1eb-4c8d-9faa-2fee17e91b3c
#animals #form #flying #snakes #tusks #spirals #evolution #shells #hearts #art #publicdomain
w 










