A link, observablehq.com/demo, (not functioning in my Chrome
browser at the present time but apparently OK in Firefox) in the
previous post suggests . . .
"Physically meaningful observables must also satisfy
transformation laws which relate observations
performed by different observers in different
frames of reference. These transformation laws are
automorphisms of the state space, that is
bijective transformations which preserve certain
mathematical properties of the space in question."
— Wikipedia, Observable
Those who prefer narrative to mathematics may read
"automorphisms" as "auto morphisms."
"Before time began . . . ." — "Transformers" first line, 2007