# MOTION ADDENDUM — DESIGN ROUND 8
**Portals, HUD opacity, ACTIONS arriving, cross-surface continuity · extends R4/R6/R7 motion law · July 13, 2026**

The constants stand: light announces, never pulses for attention; the ally band is the continuity object; 1400ms is the long crossing; nothing bounces; the only standing motion is state being true.

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## 1. Portals (01 · 1a)

- **The rim breath** is the Portal's only idle motion: opacity 0.45 ⇄ 1.0, period 3.2s, sinusoidal — the same breath as a package in flight, because both mean "this will respond."
- **Crossing** is the R6 drift, now with two ends: the departing Scene recedes 6% and dims over the first 500ms; the arriving Scene is already live behind it (state arrived before you did) and takes light over the last 600ms. Total 1400ms. The ally band never unmounts; the container chip morphs its text at the midpoint.
- **A closed end** goes dark over 900ms when closed while you watch — a door going dark, no lock animation, no shake on attempt. Attempting it gets a band sentence, not a bounce.
- **TV crossing** stretches to 1800ms — the couch is farther away; nothing else changes.

## 2. HUD opacity (01 · 1b, 03 · 3a)

- **Translucent → risen**: the thread rises with the finger (direct manipulation, no easing until release), then settles 240ms. Ground dims to 70%.
- **Risen → opaque**: chosen by a pull past the threshold or by the two words "just us." Backdrop goes to 96% over 320ms; the Field's standing motions (breaths, walks) continue underneath — visible dimly, because the world not stopping is the point.
- **Release**: swipe down or "back to the ground" — the thread falls 280ms, the ground takes its light back over the following 200ms. The band re-anchors last, always.
- **Desktop side-by-side**: the opaque HUD sliding to stand beside the Field is R7's 420ms `cubic-bezier(0.3, 0, 0.2, 1)`, unchanged; it is the same opaque state given its own column, not a new posture.

## 3. ACTIONS arriving (01 · 1b)

- An ACTION **fades in at its object**, 350ms up, from 92% scale — the R4 arrival curve. No slide-in from an edge (edges imply trays), no sound.
- If you are elsewhere, nothing moves at all: the ACTION exists at its object, and the ally may say one sentence. Arrival motion happens only where the object is on screen.
- **"Not now"**: the card recedes to its object outline in 240ms and stays there as shape. Nothing counts up anywhere.
- The **held intention** ("at my desk later"): on the phone the card folds to a small held mark at the object, 300ms; when Studio next opens, that object's ACTION is the first thing the band offers — offered, not modally presented.

## 4. Cross-surface continuity (06 · 6b)

- **The same event never animates twice.** If a package return played its arrival in Studio, Live states it as text in the meanwhile; TV shows the object already at rest. Motion belongs to the surface where the state change was first witnessed.
- **Gesture meanings are constant, so their motion is constant**: the press-and-hold ring fills in 1100ms on phone and web alike; TV has no ring at all — long-press OK yields a band sentence with ordinary text timing.
- **The gold ceremony is unchanged and unscaled** (R3): ring fill 1100ms, embers, haptic where hardware allows. It plays only when the act enters the authoritative Record. Light-level acceptance has no ceremony — the draft chip dissolves 400ms after the receipt lands (R7).
- **TV focus** moves between sky rims in 160ms steps; hold-to-walk moves presence at walk speed, the same walk speed as every surface — the couch does not teleport.

## 5. The always-live ground (01 · 1d)

- **State arriving** in a Scene you occupy: the changed object brightens once (350ms up, 600ms down) — the arrival curve, never a badge.
- **Disconnection as weather**: the ground dims 20% over 2s; standing breaths pause at their dim phase; the band states it. **Reconnection is a sunrise**: light returns over 1200ms from the ground up. No spinner exists anywhere in the Field.
