Angle of repose · No. 115
The hourglass that keeps its own time.
A waisted glass, a column of sand, and gravity. Each grain falls, slides against its neighbours, and settles into a cone at its angle of repose — a slope that holds until it doesn't, then lets go in a small avalanche. Arena measures nothing but the fall itself.
A waisted glass of falling sand — your browser could not open a canvas for the live grains.
Grains settled
0/ 0
Elapsed
0:00
Fallen
0%
Repose
—°
01 — The neck
A doorway five grains wide
The whole instrument is the pinch in the middle. Widen it and the sand pours; narrow it and the same volume takes an hour. Here the neck meters a few grains a frame — enough to trickle, never to rush.
02 — The cone
A slope that argues with gravity
Grains landing in the lower glass pile into a cone. Each grain will only step straight down or slide diagonally, so the slope can never exceed one-to-one — it settles near forty-five degrees, then sheds the excess in a small avalanche.
03 — The flip
Time made of the same sand
Nothing is added and nothing is spent. The count is the sand, the sand is the count. Turn the glass and the top fills from the pile you just made; the clock returns to zero and the fall begins again.
“Every grain is identical, and every fall is different. That difference is the only thing being measured.”
Arena · a physically-piling sand column