Portret van Nicolaus Petri Titelpagina voor N. Petri. Practicqve, om te leeren rekenen, cypheren ende boeckhouden, 1605

Nicolaus Petri is shown in a ruff collar, using a pair of dividers to measure a terrestrial globe. The scene is filled with tools of early modern science, including an armillary sphere, a complex geometric solid, and a quadrant on the table. In the background landscape, a small figure is seen using a cross-staff for surveying or astronomical measurement.

This image reflects the 17th-century transition from practical commerce to natural philosophy, specifically through 'Mathesis'—the study of the world through number and measure. The inclusion of the 'Reghel Coss' (early algebra) and geometric solids connects to the Renaissance belief that mathematical principles were the divine architecture of the cosmos.