Artefactos symmetriacos, e geometricos : advertidos, e descobertos pela industriosa perfeicʹao das artes, esculturaria, architectonica, e da pintura ...
A 1733 Lisbon treatise on symmetry and geometry by Ignacio da Piedade Vasconcellos, printed by Joseph Antonio da Sylva, aimed at artists, sculptors, architects and painters who needed proportion rules. Its pictures are plain line diagrams of circles, chords, and perpendicular bisectors with lettered points, labelled step by step in the manner of a construction manual, so a designer could borrow the compass-and-straightedge logic for layouts and modular grids.
