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On a summer day, the brass push plates of these doors become too hot to touch. To prevent unhappy customers, someone covers them with a paper sign.
The sign is spare in its prescriptions: “Metal is hot!!” It does not tell you what to do. It does not editorialize much on the problem—though the double-exclamation marks betray a point of view.
Interestingly, the insulating properties of paper means this sign does indeed solve this design problem—but the words have nothing to do with it. Larger, blanker paper would have sufficed as well.