Treatise page with ray, curve, and triangle diagrams
Mirror-script prose with three marginal geometric sketches
Blocks of mirror-script prose, interrupted by short headings and a small column of side-notes at the left, share the leaf with three pen diagrams in the right margin: a sinuous curve rising over a horizontal base at the top, a pair of lines fanning from a point with short cross-hatching in the middle, and a low triangle traversed by a line near the bottom. The line-and-angle figures are consistent with studies of vision or of light falling at an angle, but the surrounding text is not transcribed in this bundle. Red foliation appears at the upper corner.
On this page
Marginal line-and-angle sketches
Three small figures sit in the right margin: an undulating curve over a straight baseline, a pair of lines diverging from a single point with short hatch strokes between them, and a shallow triangle crossed by a line. Diagrams of this kind commonly accompany discussion of rays, angles, and the fall of light or lines of sight. The related prose is present on the leaf but untranscribed here.