Lattice offset — where it appears
Counting the spirals
Almost every claim about phyllotaxis is a claim about how many spirals run through a pattern, and the count is almost never done. It can be done from the points alone, by machinery that is never told what angle built them — and then a count of 34 is evidence rather than a restatement.
The counts change with radius
The same head gives 13 and 21 near the centre, 21 and 34 further out, 34 and 55 beyond that, and 55 and 89 at the rim. The transitions are at computable radii, and a photograph captioned with one pair is a statement about one annulus rather than about a flower.
Named alongside it
The objects these essays reach for when they reach for this one.
BranchDivergence angleFibonacciRiseTransitionsAnnulusContinued fractionContinued fraction convergentDiscriminationLocal minimumNearest neighbourNoise