Parameter space — where it appears
Raup's three numbers
Nearly every coiled shell that has ever existed is a point in a three-dimensional space — how fast the whorl expands, how far the opening sits from the axis, how far it travels along it. That is a remarkable compression, and the most useful line in the space is the one where the whorls come apart.
Two shapes, one threshold
Read in the same unit, an exponential falloff and a gaussian one disagree about where the lattice ends by half. The quantity they agree on turns out to be one the previous phase measured for an unrelated reason — and it agrees with a bracket left by a sweep of a completely different parameter.
Named alongside it
The objects these essays reach for when they reach for this one.
CensusCross validationCut offDivergence angleEnsembleEvoluteGrowth factorIdentifiabilityThe range of the interactionInvoluteLattice offsetMeasure