A signal is a claim in motion

The useful unit is not a chart. It is a trace, a model, and a question that can still be checked.

Glossy cyan ribbons curve around a multicolored central form.

Begin with the surface

A blackboard-style website study with a pale oscillator plot.

This is a site study, not an observation. The data used later is synthetic.¹

Quantity	Meaning	Unit
$t$	elapsed time	s
$x(t)$	displacement	m

x(t) = e^{-0.18t}\cos(2.4t)

oscillator.ts

const damping = 0.18;
const frequency = 2.4;
const displacement = (time: number) =>
  Math.exp(-damping * time) * Math.cos(frequency * time);

flowchart LR
  Source[Source file] --> Figure[Inspectable figure]
  Figure --> Claim[Written claim]
  Claim --> Question[Next question]

The point is not a beautiful diagram. It is a path back to what the diagram means.