CAST IRON / CIRCLE / STREET SURFACE

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Visual principle

Treat cast iron as urban graphic design: circle, border, embossing, repetition, rust, and pavement contrast rather than infrastructure instruction.

What to notice

Look at radial marks, check patterns, raised lettering, worn edges, rain-darkened metal, and the boundary between cover and street surface.

Editorial use

Use one strong circular image as the anchor, then alternate detail crops and wider pavement context.