Visual Plane
every picture states the point it is correct from
Concept

Projective limit — where it appears

2 essays name this object, across 2 fields. What follows is each of them, and the objects they name alongside it.
isometric — the limit2.5 m6 m20 m200 msame box, same drawn sizethe eye recedes

The eye taken to infinity

A parallel projection is a photograph from infinitely far away with the lens lengthened to match. That is not an analogy — it is the limit, it can be watched happening, and it explains why a long lens flattens a scene and why an isometric drawing has no viewing distance to state.

parallel · limit head0.668profile — the outline that names a faceeye0.669frontal — an eye in profile is a wedgeshoulders0.669frontal — the width that says two armslegs0.668profile — a stride is a side viewpond0.326plan — a rectangle of water is a rectangle1.000 — what its own aspect keepsshare of each part that reaches the picture, from the best single direction|d · n| for each part3.000 of 5, swept and in closed form

Assembled from several views

An Egyptian relief takes each part of a figure from the direction that identifies it — head in profile, eye and shoulders frontal, a pond in plan. What that buys is exactly measurable: any single viewing direction keeps at most √k of k perpendicular aspects, so the best compromise view retains 58% of each.

conventions · aspective

Named alongside it

The objects these essays reach for when they reach for this one.

IsometricOrthographicArea scaleAspectiveDemonstrationDepth compressionDrawing systemForeshorteningIdentifiabilityOcclusionOrthographic limitParallel projection

All concepts