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

Depth reversal — where it appears

The second reading of a picture, in which each point moves to the other point of its own ray, giving a mirrored solid that draws the identical picture.

Named by 2 essays across one field — each of them below, with the objects they name alongside it.

what was drawnthe solid it depicts — reading 1 of 2xyzlooked at 45.00° off the normalcube edge 1.0000 of the drawn unitresidual 5e-16

Any three lines you draw are a cube

This site has said, for four rungs, that cavalier projection is not the projection of anything — because its axis scales sum to three where every orthographic projection sums to two. That is true of orthographic projection and false of projection. Three lines from a point, drawn by hand, are a picture of an actual cube seen from an actual direction, and the cube and the direction come out of the drawing in closed form.

parallel · pohlke 010200.1000.2000.3000.4001 / distance from the eye to the box (per metre)worst angle between edges the box has parallel (°)parallel projection: 0.000°55° at the near endthe line through the origin is the inverse law

The drawing does not say which corner is nearer

The Necker cube is filed under optical illusion, as though the flipping were something the eye does. It is not: a parallel drawing of a cube is a drawing of exactly two cubes, mirror images of each other, and they project to the identical picture to the last bit. Perspective rules the second one out at a rate exactly inverse in the eye's distance, and never entirely.

parallel · reversal

Named alongside it

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

DemonstrationDrawing systemParallel projectionPohlkeAxonometricDegeneracyDepth cueOblique projectionOrthographicOrthographic limitPlanometricProjected not constructed

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