Chronos Chair's connecting element could have been cast in four parts and joined. Mechanically nothing forbids it. The studio poured it as one piece anyway, three times, and kept the third.
The first pour cooled unevenly where the path narrows under the seat plate and cracked in the mould. The second survived demoulding but carried a cold-shut line across the most visible run of metal — a seam exactly where the eye follows the vein between armrest and ground mass. Repairing it would have meant grinding into the gesture itself.
The third pour succeeded because the simulation was corrected against the first two failures: two risers moved, the narrow passage thickened by two millimetres, and the entire mould preheated longer than the foundry considered reasonable.
A joint is a place where the object admits it was made in pieces. This object refuses to admit it.
Gallery Threshold, cast at architectural scale, inherited the corrected riser strategy directly. The archive records failures for exactly this reason: the third pour of one specimen is the first pour of the next.