Visual Plane
every picture states the point it is correct from
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The thread: Projected, not constructed — page 7

Every point in every figure here comes out of a camera with a focal length, not out of a line run to a vanishing point that was placed where it looked right. A picture no camera could produce fails to build rather than appearing with nothing to say so. Essays 145 to 145 of 145.
the axis's vanishing pointthe photographtaper 1° per side · drawn at 0.72×4.2 px missed by the habit Drawn confidently

A tapered part meets at its apex

The sides of a turned part that narrows by one degree meet 54 pixels from the vanishing point of its axis, at the image of its apex, and a quarter of a degree already moves them 15. Drawn toward the vanishing point instead, a two-degree part loses nine tenths of its own taper. Flare it the other way by 5.9 degrees and a correct photograph prints its sides parallel; flare it further and they spread with depth.

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