Silhouette — where it appears
Named by 2 essays across one field — each of them below, with the objects they name alongside it.
The outline is mostly crease
The edge of a folded model is what a reader looks at, and almost none of it is the edge of the paper. Measured across five patterns, the sheet's own boundary accounts for between nothing and a third of the exposed edge; the rest is fold, and on a waterbomb tessellation the raw edge does not reach the outside at all.
The shadow does not name the pattern
A photograph of a folded model carries an outline and a thickness at every point of it, and that is the whole of what it carries. It is not enough. Crease patterns in genuinely different places fold to identical outlines with identical layer counts, and nearly a third of the folded objects a short strip can reach are reached by more than one pattern.
Named alongside it
The objects these essays reach for when they reach for this one.
Folded stateBoundaryConservationCountingCrease patternEnumerationIdealisationLayer countLayer orderingOne-dimensional foldingUnderdetermination