Perspective Projection of a Square and Circle with a Star Figure
A square, a foreshortened square and a spoked circle on sight-lines below a star-burst
The upper part of this recto carries a clear pen construction: a small square, a foreshortened square drawn as a trapezoid, and a large circle divided into segments by radii, all strung along straight lines that converge to a viewpoint, showing how a square and circle project to the eye as they recede. Above them a many-pointed star of radiating lines surrounds a small circle. Faint mirror-script, not transcribed in this bundle, runs below and beside the figures. Further untranscribed writing is present across the lower half.
On this page
Square and circle projected along converging sight-lines
A small square, then a foreshortened square shown as a trapezoid, then a large circle are set in a row and tied together by straight lines that converge to a viewpoint at the left. The sequence shows how a plane square and a circle appear to change and diminish as they recede from the eye. It is a projection or perspective demonstration of the two figures.
Circle divided by radii with points on the rim
The large figure at the right is a circle divided into equal segments by radii, with points marked around its circumference. The spoked division reads as a circle prepared for measuring or for showing its foreshortening. It anchors the right end of the perspective row.
Star figure of radiating lines about a small circle
Above the perspective row, straight lines radiate outward from around a small circle to form a many-pointed star. The figure is drawn with a ruler in fine strokes. Its role is not stated in the transcribed material, and it sits apart from the projection below.