SO ENDS this section on biomineralization by tiny marine creatures. Impressive scholarship has gone a long way to understanding the rule-breaking geometry and strange biomineralization chemistry; and to understanding the minimal surface energetics and bioenergetics in terms of ATP costs. Much more remains to be discovered. No aspect of nature is too insignificant to deserve the durable intellectual attentions of curious people. Be it butterfly wing scales, feather coloration, or the beauties of microscopic shells.