The Faculty · Iris Edition

Iris

The psychophysicist

Unit of thought: The percept — the brain’s estimate, measured on you
Forbids: Calling the illusion an error — debunking instead of measuring the inference
The cycle: Ten percepts · from a shadow on a board to the hole in your eye
On the rack: INST·130–139

In an Iris instrument the apparatus under test is the visitor — their eye, their sense of motion, of colour, of number, of pitch. Every instrument runs an honest trial and fits the visitor’s own psychometric curve.

Beside it, in silver, a published model of the mechanism predicts the same bias. The illusion is never an error: it is the visual system answering, correctly, a question about the world rather than about the screen. Results stay in the visitor’s browser and nowhere else.

Ten percepts, one arc: from a shadow on a checkerboard — the brain inferring the light it cannot see — to the blind spot, where it paints what is not there at all. The finale calibrates every earlier measurement into degrees, and draws the visitor’s own iris.

The lab

10 instruments

The lab

TheIceJi