What thousands of years of foot traffic does to marble stairs

These stairs don't look quite up to code, but they all look well loved. This photo collection features steps that have been indented and sculpted over time by the feet of people who walk them — slowly, imperceptibly, one footfall at a time, until the stone dips in the center like a hammock. — Read the rest The post What thousands of years of foot traffic does to marble stairs appeared first on Boing Boing.