"Relatively small decreases in the angle of ascent make a big difference in the ease of the climb. The key is the riser. The small difference between the standard 7 inches and the much less common 6 inches makes for a whale of a difference, on long flights especially. Treads are important too, of course. The minimum depth should be 12 inches. If it is less, men have trouble fitting their feet to the space and often go down sideways, with crablike steps."

-- William H. Whyte in CITY: Rediscovering the Center


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