Visual Plane
every picture states the point it is correct from
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The thread: What a projection destroys — page 6

Length goes, angle goes, area goes, and the ratio in which a point divides a segment goes. Knowing precisely what is lost is what makes the one surviving quantity worth anything, so the losses are measured alongside it rather than mentioned. Essays 121 to 121 of 121.
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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