Two Alternate Designs for the Vault of a Chapel with the instruments of the Passion

Anonymous, Italian, Piedmontese, 18th century · 1700–1780 · Pen and brown ink, brush and gray wash, over leadpoint or graphite, with ruled and compass construction; measuring scale, at bottom, in pen and dark ink

From the collection of The Metropolitan Museum of Art. Free to download, adapt and use — no permission needed.