Why do some window grilles have a curve at the bottom?

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Why do some window grilles have a curve at the bottom?
Window grilles, also called security grilles, have been used for centuries as an effective barrier against burglary and unauthorized access. Beyond their protective function, some grilles feature an outward-curving design at the bottom, commonly referred to as the “granny belly” or “donkey belly” style. But why this particular detail?
Functionality and design combined.
This type of curve isn’t just a matter of aesthetics. It offers several practical advantages that lead many homeowners to choose this design:
More usable space: The curve creates additional space between the grille and the frame, ideal for placing flower pots, herbs, or even portable air conditioners without compromising security.
Better ventilation and light: By moving the grille bars away from the window frame, you allow for better air circulation and more natural light, which is especially important in hot weather.

Climate zones are useful.
Aesthetics and added value: This type of design gives the facade a classic or handcrafted touch, thus increasing the visual appeal of the house and, in some cases, even its commercial value.
Safety first:
Even if the design is appealing, safety remains paramount. To ensure effective protection, it is important to consider the following:
Durable materials: The best choice is galvanized steel or wrought iron, as these offer high resistance to cuts, corrosion, and weathering.
Professional installation: Proper installation is essential. To see the rest, tap the photo.