Matched design — where it appears
Named by 3 essays across one field — each of them below, with the objects they name alongside it.
Seven rises and two seeds
One organ removed from a stem is felt out to the larger of its two spiral counts. Every test of that has confounded the count with the rise, because on one branch the two move together. Grow a second branch beside the first at the same rise and they come apart — and doing it at seven rises turns a matched pair into a design whose last column changes hands four times.
The front that reads one short
Eleven cells of a fourteen-cell design put the boundary exactly at the larger spiral count. Three put it one offset earlier, and the tempting move is to lower the threshold until all fourteen agree. Measured instead of tuned, the three turn out to be the three cells nearest below their own rung's boundary — and the last offset of a front is weak because it has only just arrived.
The hole on the other branch
Near a transition, the run of offsets a stem notices stops being a run: there is quiet past the front and then one isolated offset, felt as hard as anything inside it. Where that offset sits was pinned down on Fibonacci lattices, where the numbers to check it against are 5, 8 and 13. On the Lucas branch they are 4, 7 and 11 — and the rule holds there too.
Named alongside it
The objects these essays reach for when they reach for this one.
AblationBranchHonest limitsLadderMeasurementParastichy pairRungDiscriminationFalsifiabilityFibonacciIdentifiabilityLucas numbers