Fukinuki yatai — where it appears
What the removed roof buys
The Japanese convention of drawing an interior with its roof lifted off is usually explained as a way of seeing inside. What it actually buys is uniformity — every room reports the same share of its floor, to the last sample, where the eye that frames the same building reports three different numbers.
Measuring a room off the page
A perspective picture of a floor has to be rectified before anything on it can be measured, and the rectification is a fit that amplifies the marking error. An oblique picture of the same floor is already rectified — the page is the plan, at one scale, and a ruler on the paper is a ruler on the ground.
Named alongside it
The objects these essays reach for when they reach for this one.
Area scaleDrawing systemOblique projectionDemonstrationerror propagationfield of viewHomographyOcclusionOrthographicParallel projectionRectificationReference length