This study by Peter Paul Rubens shows a cubic analysis of the Farnese Hercules; on the recto of the sheet there are back and side views that similarly reduce this figure to the elemental forms of square, arc and equilateral triangle.
Study of the Farnese Hercules, pen and ink on paper, 19.6 cm x 15.3 cm, ca. 1601–1602, artist: Peter Paul Rubens; source: © The Samuel Courtauld Trust, The Courtauld Gallery, London, https://courtauld.ac.uk/, Accession Number D.1978.PG.427, https://gallerycollections.courtauld.ac.uk/object-d-1978-pg-427, Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International (CC BY-NC-ND 4.0), https://creativecommons.org/licenses/by-nc-nd/4.0/deed.en.