Parallax Print

One picture, three materials. Touch it; tilt it.

Picture

Sample

What the tilt turns between

Views
Tilt one way for the painter's value study (flat grey planes), the other for the colour study (flat colour families, all at one value). The same planes as Two Drawings.
The reader walks the picture; each angle shows it uncovered up to one more fixation, in the order the eye goes.
Two settings of the reader (Default and Fine art) walk the same picture. Each view keeps what one of them looked at; tilt across their disagreement.
Two pictures in one print: a painting and its reference, or two sessions of the same painting.
On a phone, Use tilt reads the phone's angle; hold it the way you like first, that becomes the middle.

Material

A halftone of floating dots. Touch pushes them away; they breathe back home. Tilt re-sizes every dot into the next view.
Dot colour
Paper
One continuous thread wound round a frame of pins, each strand laid where the most darkness remains. Tilt runs through its history, from the first strands to all of them. Touch plucks the strings.
Thread
Two threads, after Petros Vrellis and other string artists: the paper is toned to the picture's middle value, a dark thread lays the shadows and a light thread the lights (60% as many strands). Changes apply when you thread again.
At 0 the thread follows darkness alone. Raising it weights the darkness toward where the reader's eye goes, so the thread is told where to look. Re-threads when you let go.
A lenticular print: strips of every view sit under a ridged lens, and the angle picks which strip you see. Touch ripples the flip.
Measured pitch (lines per inch)
Print the pitch test at 100% (check the 1-inch square), lay your lens sheet on it and tilt. The band that flips evenly, with no moving stripes, is your sheet's real pitch: type it in above, then make the print.
For a real lens sheet, at 600 dpi. Untested on a real sheet so far: run the pitch test first, since sheets and printers are off by a fraction of a percent.

Does the thread find the eye's places?

The thread is greedy, so its first strands go where it matters most to the darkness. The reader walks the same picture. This asks whether the thread reaches the places the eye goes before it reaches other places of the same darkness, and whether in the same order.
Each place is labelled with the eye's order and the thread's order (on a small screen just the two numbers, eye·thread).
Waiting for the thread and the walk.

How much does it take?

Lays the dark thread again at an eye's lead of 0, 10, 20 … 100% and runs the check at each. The answer is the smallest lead at which the thread reaches the eye's places earlier than places of the same darkness (p under 0.05) and still does at the next step up; a lone pass is listed but not counted. It will always get there in the end, since it is being told where to go: the amount it takes, and whether that amount is alike across paintings, is the measurement.

Export

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