Sacsayhuamán Site-Emblem T-Shirt, Peru

The saw-tooth silhouette of Sacsayhuaman's zigzag terrace wall, the single most recognisable image of the site, printed alongside the geometry diagram Pyramason actually tested across the Cusco region: 50 golden-ratio pairs against 32.3 expected, p = 0.0380. Beneath it: Sacsayhuaman, Peru, -13.507778, -71.982222. Those are Pyramason's own catalogued coordinates for a fortress built from blocks up to 200 tonnes, without iron or the wheel.

• Zigzag wall silhouette, the defining image of the site
• Geometry diagram shows Pyramason's real test result, significant at p = 0.0380, with its control printed beside it
• Exact coordinates (-13.507778, -71.982222) printed beneath the monument and country
• Soft, pre-shrunk cotton in a minimalist gold-on-dark line-art treatment

Why this site. Sacsayhuaman is one of only six sites in fifty where the golden ratio clears the usual significance line, and we are not going to pretend that settles anything. Run the control and an arbitrary ratio scores 1.52 against the golden ratio's 1.55, close enough to be a tie. A result that a meaningless number can match is a result about the Inca heartland's site density, not about phi. The masonry needs no help anyway: 20,000 organised workers, period tools, verified by replication.

Saqsaywaman · Peru · 13°30'28.0"S 71°58'56.0"W