Gesture ProofRead the movement

Aperture / active · local

Experiment 007 / Shape selective seeing

ApertureField

Two L-pose hands establish an optical field. Keep middle, ring, and pinky closed, then choose refraction, pixelation, or blur without sending a frame anywhere.

Camera starts only after click. Frames, landmarks, aperture geometry, and effects stay inside this browser.

Aperture signal

Coherent field

Phase
UNKNOWN
Area
0.00
Tension
0.00
Hands
-
Reason
evidence missing

No aperture selected

Optic contract

Field before filter

  • Index stays extended; thumb shapes field corner.
  • Crossed corners stay ordered and render as two triangles.
  • Thumb-index contact collapses one corner into a triangle.

Ready. Camera permission has not been requested.

Continue research spineExperiment record / 007

Experiment record / 007

A field must earn its boundary.

Phase
Make movement material
Study status
Deterministic pass
Decision
Keep / physical pending
01

Question

Can two hands establish a selective visual field without mistaking noisy geometry for intent?

02

Hypothesis

Index extension, anatomical corner order, temporal confirmation, and explicit release can make a local effect feel caused rather than pasted on.

03

Optics

  • Refraction layers offset source pixels by aperture tension.
  • Pixelation maps area to cell size.
  • Blur maps area to radius.
  • All rendering stays Canvas 2D and on-device.
04

Rejection

Hold
180 ms
Release
120 ms
Cooldown
220 ms
05

Not yet proven

Crossings, glare, sleeves, jewelry, rotations, varied hands, low light, and mobile camera quality still need physical measurement.

06

Provisional keep

Keep optical selection separate from hand tracking certainty.

Fixtures make failure visible; physical-camera evidence must tune thresholds before product reuse.

Method / 007

A field keeps its anatomy.

Aperture Field derives a local optical boundary from two index-thumb pairs. Geometry is measured before Canvas receives a field; invalid evidence remains inactive.

01

Anatomical corner order

Corners retain hand anatomy: left index, right index, right thumb, left thumb. Crossing is not repaired into a false rectangle; Canvas clips the bow-tie as two triangles.

02

Contact without snap

const corners = [
  firstContact ?? first.index,
  secondContact ?? second.index,
  secondContact ?? second.thumb,
  firstContact ?? first.thumb,
];

A thumb-index contact duplicates its midpoint into existing slots. Signal stays four-slot; rendering sees a triangle. Activation uses contact ≤ 0.075 palm scale, continuation ≤ 0.12.

03

Area, time, then optics

Two L-posesthree fingers closed Area gatepalm-normalized Local opticCanvas 2D only
  • At least two of middle, ring, and pinky remain non-extended: ≤ 0.78 on entry, ≤ 0.86 while active. This excludes clear span/open palms while tolerating one noisy fingertip.
  • Four corners need area ≥ 0.18 palm-scale² for 260 ms. Triangle gets 68% equivalent-area threshold; continuation allows 0.12.
  • Release 120 ms and cooldown 220 ms prevent a flickering field.
04

Implementation map

src/gesture/aperture-field.ts

Validates hand evidence, corner topology, normalized area, hold and release.

src/effects/aperture-field-effect.ts

Clips the approved boundary, then draws refraction, pixelation, or blur locally.

src/engine/aperture-fixtures.ts

Exercises steady, small, crossed, jitter, dropout, and contact-triangle evidence.