Commons:Image sets/gold weights and shells

example
The Akan goldweights on white background are not really an image set, because all they have in common beyond the shared subject is the white background. The shell images (compare examples below) clearly form a set. What they have in common is easily seen, but it would be almost impossible to verbalize. And it is unlikely that someone else would by coincidence present shells in the same way.
Muséum de Toulouse; Akan goldweights on white background Valued image set: Calocochlia festiva, Shell