A repeated unit is the cheapest structure a fabricator can buy: one mould, many casts. The archive refuses the discount. In Exochronos every one of the thirty-one segments differs from its neighbours, resized against the bending moment at its own station on the spine.
The decision costs five moulds instead of one and roughly triples finishing time, because seams between unequal segments cannot be hidden by symmetry. What it buys is legibility. A constant stack reads as extrusion — a factory gesture. A drifting stack reads as growth, and growth is the only ornament the studio permits itself.
A constant stack reads as extrusion. A drifting stack reads as growth.
The drift is not freehand. Segment height, wall thickness, and flare are solved from the load curve, then rounded to castable increments. Ossein Lamp is currently testing the lower limit of the rule: at one fifth of the chair's section the drift approaches the casting tolerance, and below that line variation becomes indistinguishable from error.