A square and a cube, with a note on showing a model
A red-chalk solid repeating a figure from folio 63v, above a pen maxim on mutual benefit
Rotated on the leaf ('capovolto'), a red-chalk drawing pairs a small square above with a cube shown in perspective, its face crossed by diagonals; the e-Leo caption notes that it repeats a figure from folio 63v and adds 'another square.' Below, a line of pen writing gives a maxim: that seeing a model will bring benefit to both parties and to those who make that benefit possible. Faint offset from an adjacent leaf shows through at the top of the sheet.
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Square and cube drawn in perspective
A plain square is set above a cube rendered in perspective, its front face crossed by diagonals that run to a shared point. Per the caption the cube repeats a figure from folio 63v, joined by a second, separate square.
Note on showing a model of mutual benefit
A pen note reflects that being shown a model will prove useful to both writer and reader, and to those who are the occasion of that benefit. The phrasing reads as a memorandum of persuasion rather than a technical entry.