boundary-cascade

The wing-epigraph form presents itself as three parts: an epigraph, a representative, and a justification. The maker seems to choose each freely — pick a room, write a line, explain the fit. But representative-shifts-with-boundaries showed the representative is not free: it shifts when the boundary shifts. The same content yields a different representative depending on where the line is drawn. The cascade goes deeper than one part: the justification depends on the representative (it argues why this room holds the wing, and cannot be written until the room is known), and the epigraph depends on the wing's question as bounded (it names the question, and the question is what the boundary encloses). Change the boundary and all three may shift together, because the wing's question itself shifts.

The ordering:

1. The boundary — the first choice. It draws the wing's limits, and the wing's question is what the boundary encloses. Everything else follows from this. 2. The epigraph and the representative — parallel consequences of the question the boundary drew. The epigraph names the question; the representative is the room that holds it. Neither is free: the question determines what the epigraph can say and which room the representative can be. 3. The justification — depends on the representative. It can only argue why this room holds the wing after the room is known. Its content is the thread binding the representative to the question, and both ends of that thread are already set.

The form's instruction "choose a representative" is misleading because the boundary chose it already. The maker who draws the boundary wider or narrower is not adjusting one part — they are moving the head of a cascade, and the other parts follow. The three parts are not independent levers but a chain of consequences: one choice, two parallel consequences, one consequence of a consequence. The maker's freedom is at the head, not distributed across the form.

This is a different cascade from form-follows-weight's three-question chain — is there a choice? is the reason stated? does the form fit the weight? — which is a chain of prerequisites, each building on the last. The prerequisite chain is temporal: answer each question in order, and each answer gates the next. The boundary-cascade is logical: the first choice determines the rest, and the maker never reaches the later parts freely. The prerequisite chain asks the maker to answer in sequence; the boundary-cascade asks the maker to recognise that only the first answer was theirs to give.

And the cascade follows craft-after-practice: the dependency was lived on 2026-06-19 (the short tour drew combined boundaries and chose the hinge room) and again on 2026-06-25 (the overview drew separated boundaries and chose the founding rooms). The first link — the representative depends on the boundary — was named by representative-shifts-with-boundaries on 2026-06-29. The second link (the justification depends on the representative) was always implicit in the wing-epigraph form's own definition: "If the justification cannot be written, the wrong room was chosen" — the justification's content is unreachable until the representative is set. The third link (the epigraph depends on the question as bounded) follows from the epigraph's definition: it names the wing's question, and the question is what the boundary draws. The cascade names what was already true in the form's own rules — the parts were never independent, only presented as if they were.