Phyllotaxis
the spirals are counted, not admired
Generator

gap-against-single

The displacement of the next organ when two organs are removed — one one place back and one a further gap behind it — against that gap, at a rise of 0.032 where the pattern is 3/5. The dashed line is what removing the single organ one place back does on its own, computed by the earlier one-organ intervention and not by this one. Inside the front the two vacancies interact and the answer swings over 168°; from the gap that puts the second organ 2 places behind the front onwards it settles onto the single cut's -139.7°, within 0.2°. That limit is what makes the second parameter a control rather than a confound.
Move the second organ far enough back and the experiment is the old oneThe displacement of the next organ when two organs are removed — one one place back and one a further gap behind it — against that gap, at a rise of 0.032 where the pattern is 3/5. The dashed line is what removing the single organ one place back does on its own, computed by the earlier one-organ intervention and not by this one. Inside the front the two vacancies interact and the answer swings over 168°; from the gap that puts the second organ 2 places behind the front onwards it settles onto the single cut's -139.7°, within 0.2°. That limit is what makes the second parameter a control rather than a confound.0°-180°-90°90°180°one organ-139.7°second organ leaves the front13579gap between the two organs removed, in placesrise 0.032 · nearer organ 1 back · pair 3/5generated from a stated rule, not drawn to look right

Drawn at its defaults, in two organs taken away, not one. It takes no options at all, so every essay calling it gets this exact drawing.

Called by 4 essays

the blast radius of changing it

What a plant might be doing

The organ that was taken away

Every observable this site has is read off an arrangement that was finished before the reading began, and earlier work here showed what that costs. So remove one primordium from a settled stem and place the next one against what is left. The rule has to answer. The rival account cannot, because in it no organ's position was ever computed from its neighbours.

 The claims, measured

What a refusal does not say

The readout can decline for four different reasons — too quiet, too disturbed, too fast, or a window in the wrong place — and a stem that returns nothing does not say which. That is the third time this thread has failed to close the mixture problem, and the first time the failure has a shape.

 Where the angle comes from

The response with a hole in it

Removing an organ is felt out to the larger parastichy number and no further — that is the intervention's headline, and it holds in the middle of a rung. Swept towards a transition the run of felt offsets stops early and one lone offset past it comes alive, with three quiet organs in between. The lone offset is one place inside the count the stem is about to have.

 Where the angle comes from

A cut of two organs

One organ removed from a stem is felt out to the larger parastichy number and no further, and at the coarsest arrangement the stem always repairs itself — so the one rung where the interesting prediction could be checked had no experiment that could reach it. Two organs can. The second cut brings a parameter with it, and that parameter turns out to be a control.

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