Medieval geometry demonstration at Guédelon—

 Medieval geometry demonstration at Guédelon—

 

 

A builder (likely a stonemason or master mason) is using a wooden compass to draw geometric patterns in the sand. Here’s what’s happening and why it’s significant: Medieval geometry practice Builders at Guédelon use period tools like large wooden compasses, straight edges, and cords to plan and measure structures — exactly as 13th-century masons did. The circles and intersecting lines drawn on the ground are part of geometric design layouts used to determine proportions for windows, arches, towers, and other architectural elements. This is often called a “tracing floor” (in French, lodge de tracé or aire de traçage), where masons sketch full-scale plans before carving or laying stone. Why it matters At Guédelon, demonstrations like this help visitors see how medieval builders worked without modern drawings or blueprints — relying instead on geometry, proportion, and craftsmanship.

 

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