MOTION-001 The Interval Thornbury Lab
A dancer held horizontally in mid-air, supported on one hand, lit hard from behind through smoke.

The
Interval

Motion study no. 001

One rotational floor movement, recorded at thirty frames a second and taken apart. What follows is not a film. It is twenty-nine positions and the darkness between them.

Scroll
4.67 seconds
29 plates
141 frames recorded

A photograph cannot record movement.

It records a position. Then another. Then another. Everything you would call motion happens in between — and the in-between was never recorded at all.

Persistence of vision does the rest. Hold two near-identical positions close enough together in time and the eye refuses the discontinuity, inventing the travel between them. Cinema is built entirely on that refusal. So is this page.

The sequence Scroll advances the shutter
Frame from the motion study: the dancer loads into a crouch before the launch.
01/ 29 · 0.00s
167 ms discarded before the next plate. The movement continued. Nothing observed it.

Four fifths of this was thrown away.

Twenty-nine plates survive from one hundred and forty-one recorded frames. The movement in between was real, and is gone.

And then

For one hundred and sixty-seven milliseconds, nothing here is known.

The Plate

Twenty-nine positions · 4.67 seconds
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29