Motion Primitive Catalog

Timing & latency (applies to every primitive)

• Hard hits are 0ms. Cuts, palette flips, content swaps, freezes are tl.set(...) with no duration — the percussion is the motion. Easing a hit kills it.
• Lead the anchor. A move that must land on a beat (a wipe covering the frame, a count-up locking, two blocks colliding) starts ~40–190ms early so it completes ON the anchor. Reactive entrances (something appearing because of the hit) fire 0–45ms after.
• Eased entrances: 300–500ms (scale punch, slides, camera pushes). Macro builds: 800–2000ms spanning a whole roll / silence.
• Per-bar caps: one accumulating element per hit (not a burst); a camera move at most once per phrase, never per beat; a dense flip/strobe system runs ≤2–3s.
• Tension-builds lock. A count-up / sequential build / morph must resolve on a downbeat or hard_stop, never trail off mid-bar.
• Best span means active motion. The catalog’s span guidance is not a license to stretch one primitive over a whole frame. If a free-composed group runs longer than the listed span, add a hold / bed / next primitive, or split the frame into another group at the next musical anchor.

Catalog

How to combine

• One dominant system per group; layer at most one texture primitive over one structural primitive.
• Structure on strong beats (cuts, camera, system-replace → downbeat / phrase / section_start); texture on weak / syncopated hits (content-swap, typewriter letters, chromatic accents).
• A roll is an accumulation container — build during it, hard-cut to a clean layout on the downbeat that ends it.
• drop ≠ downbeat: a downbeat is a cut within the regime; a drop is a regime change (system-replace, total clear, element-count jump).
• Let silence remove density (negative-space-hold).
• Background beds are a layer, not a move: one bed at a time, under foreground primitives.
• text-spectral-rays is the hero wordmark treatment; do not stack another visible copy of the same word on top.