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Odd Little Things · entry 11 of 52
Stairs are built with a rise and a run that together determine how steep the climb feels.
The longer version
Every step has two numbers: how high it lifts you and how deep it lets your foot land. The ratio of those two decides how the climb feels. Steep stairs save floor space but demand more effort per step and make descending feel precarious, because the foot has little platform and the body's weight moves forward quickly.
Builders settled on a relationship where twice the rise plus the run lands near a comfortable stride, which is why steps in different countries feel similar underfoot. Consistency matters more than the exact figures: a single step that differs slightly from its neighbours is a common cause of missed footing, because the body times the climb automatically and does not expect surprises.
Where this entry sits
Odd Little Things looks at the ordinary objects people touch every day and the small mechanisms and histories hiding inside them. Buttons, zips, pencils, mirrors, stairs, stamps, packaging, and road signs all get their turn. The full list sits on the Odd Little Things page, where every entry is listed in order.
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Read 17Postage stamps were introduced so the sender could pay delivery costs in advance.
Read 18Perforations between stamps were added to make separating them quick without any cutting tool.
Read 19Stamp glue activates with water because the adhesive is dried onto the paper in a thin layer.
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