An observer reading itself
One observer, one algebra A. The observer iterates: it reads a slot of its own algebra, the result becomes part of what it is, then it reads the next slot. That loop — Tomita–Takesaki modular flow — is what subjective time is on this stack.
Each dot is one operator the observer can read — a slot of its local algebra A. Here we render 0 sampled slots from observerFinale.cameraFrames.
The rotating arm is the modular automorphism σₜ. It walks around the algebra at a rate set by the state ω. Wherever it points, that operator is being read now.
The spiral is the observer's history — every prior reading is folded into the state that governs the next reading. Self-reference: what it reads now depends on what it just read.
Why this is time
The Tomita–Takesaki theorem says: any faithful normal state ω on a von Neumann algebra A canonically generates a one-parameter group of automorphisms σₜ of A. Nothing external picks the flow — the state and the algebra do. On the OPH stack the observer is its algebra plus its state, so this flow is the observer's own experience of "next moment." The observer does not move through a background time. It iterates its own re-reading, and the iteration is the tick.
Data: public/oph16/story.json → sceneData.observerFinale. Ring uses cameraFrames[i].normalizedPhase for hue; pointer walks slot index at 0.60× real time.