Friedrich Wilhelm Joseph Schelling (1775–1854) was a German philosopher. His Munich address on art and nature poses a question one can ask of a single crystal: how can something acquire a shape that can be drawn with a ruler when nobody drew it?
Form without a plan
An artist can distinguish a design from its execution. For Schelling, nature does not execute a plan conceived beforehand. Its activity and the rule we discover in it belong together.
Thus raw matter strives, blindly as it were, for regular shape and unknowingly assumes purely geometrical forms, which surely belong to the realm of concepts and are something of the spirit within the material.
– Friedrich Wilhelm Joseph Schelling, Philosophische Schriften I: Ueber das Verhältniss der bildenden Künste zu der Natur, p. 352.[1]
What art imitates
A drawing can reproduce the outline of a regular mineral. The comparison asks for a further step: to look past the finished surface to the activity that gives rise to it.