Why are some window bars curved at the bottom?

While strolling through an old neighborhood or glancing up at a building in the city center, you may have noticed those window grilles that curve slightly outwards. A rounded shape, almost like a small metallic “belly.” Decoration? An architect’s whim? Not at all. These subtle curves actually conceal an idea that is as practical as it is ingenious.

Window bars that are anything but ordinary

Security bars have existed for centuries. Their main purpose is simple: to protect homes by reinforcing openings, often considered vulnerable points.

But over time, strictly straight lines have given way to more elaborate shapes. Among them, the outwardly curved model — sometimes called a “bulging bar” — is no accident.

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