The Shape of Snails

“the conceptual world of pre-eighteenth-century zoology must
have accorded little importance to the orientation of a
shell”. We will refer to this as the ‘Gould hypothesis’.

-from: From a ‘domestic commodity’ to a ‘secret of trade’: snails and shells of land molluscs in early
(mainly 16th and 17th century) visual arts 

"chirality" is the direction in which the snail shell is oriented