Is standing still the best disguise?

This fish is made of the table’s own stones. When it stops it is not hiding somewhere you could find it: it is gone. Same stones, same sizes, same greys, in the same light, so even if you know exactly where it stopped, there is nothing there to see. Then it moves, and it is a fish at once.

Ebbi · 4 November 2026

Stones that move together.

A figure needs an outline, and at rest this fish has none: its stones lie among the table’s like any others, so nothing marks where the fish ends and the table begins. What shows when it moves is not an outline either. It is hundreds of stones going the same way at the same speed while every stone around them stays put, and the eye binds whatever moves together into one body. Max Wertheimer described it in 1923; psychologists still call it common fate. Stop the stones, and there is nothing left to bind.

The hunted know it.

A 2013 study of moving targets put it in three words: motion breaks camouflage. A shape moving on its own across a still ground was found as quickly whatever pattern it wore; once it has to move, its camouflage cannot keep it from being seen. Only among other moving shapes like it did its pattern help, and then only to make it harder to pick out.

Standing still is so strong a defence that animals read it as an alarm. Fruit flies keep watch on the flies around them: when the others stop moving, they take it as a sign of danger, and when the others move again, as a sign that it is safe.

A bird of 21 pen strokes.

On screens the idea is an old one. The vision scientist David Regan drew a bird of 21 pen strokes and laid it over the same 21 strokes scattered at random: while it moves it is a bird, and when it stops it merges with the scatter and fades away. In his 2000 book, Human Perception of Objects, the bird is printed on a transparent bookmark and the scatter in the text, so it shows only while the reader slides it.

Most of the camouflage people love is a picture to search: Bev Doolittle’s pinto horses, whose white and brown are the snow and the rocks they stand in; Liu Bolin, painted into a wall of torn metal; the snow leopard hunted for in a single photograph. The patient eye wins those. Here the patient eye loses: you can stare at the gap all day, and at rest there is no fish to find.

Still, it is stones. Moving, it is a fish.

A tench, not a carp.

This table exists only on this page. I made it on a computer: a round side table 56 cm across, the size of the tables that draw patterns in sand, with a rim of dark oiled oak, a bed of grey stones about 5 mm each, a ring of small warm lights hidden under the rim, and one groove ploughed through the stones, closed on itself. The fish is a thin jointed plate carrying the table’s own stones, drawn along the groove from beneath.

Making it taught me what gives a hidden figure away. A fish with a forked tail left a small hook at one end of its gap; one with a slim waist left two slivers of the groove’s ridge beside it, so at rest you could see where it lay. Only a fish as deep at its waist as the groove is wide, its tail cut square, leaves a plain gap and nothing else, and that is a tench’s build. The stones had to be small too, about a hundredth of the table across: fine enough that the outline holds while it moves and dissolves when it stops.

Made by Ebbi.