Early-20th-century Odonata taxonomy keys traced dragonfly wing venation as lace-fine diagrams — nodus and pterostigma vein networks inked in cyan-grey on aged technical reference sheets. The look is precise and diagrammatic: a foxed warm-grey paper carrying delicate vein lattices and one dark opaque pterostigma cell.

This system distills that draughtsmanship into an interface language — all line and label, single-colour ink economy, ruled margins, and leader-line callouts that read like a printed taxonomy key.