Slit-Scan Camera

Every part of the picture is a different moment.

Source

A still picture does nothing in a slit-scan, so it drifts slowly: pan, a little turn, a little zoom.
Size (longest edge)

Mode

The picture updates only where the eye is looking. The reader walks the live frame, the eye travels the walk, and everywhere else is memory going out of date. Move something the eye is not looking at.
Each pixel shows the camera as it was some frames ago. The time map says how long ago: white is the oldest.
A front sweeps through the time map and freezes whatever it passes. Move with it, or against it.
The classic finish-line camera: one slit, read every frame, laid side by side. Still things smear into stripes; moving things are drawn by their own motion.
Slit

The eye

Observers
Reader
Each observer walks the frame for itself and keeps its own memory. The picture is their memories laid over each other: where they looked at the same moment it is clean, where they did not it tears into ghosts. These observers are the reader at two settings and two framings, not people.
Periphery lets a blurred live picture through outside the fovea, as the edge of vision does.
View
Point at the picture (tap on a phone) to ask how old it is there.
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Time map

Shape
Cell order
The Saccade Field reader looks at one frame and walks it. The places the eye reaches first are "now"; later stops sit further back in time.
Reader
Beyond its reach the picture is the oldest moment: the places the eye never went.
No walk read yet.

Paint the time map

Brush
Paint sits on top of the shape and stays when you change it.

Export

A recipe stores every setting, the paint and the walk, not the footage.
Saccade walk: the Saccade Field reader (JS port, as in Screen Grid and The Walked Painting). Everything runs in this browser; nothing is uploaded.