Many window grills, especially in residential homes, have subtle curves at the bottom instead of straight bars. The reasoning is both practical and aesthetic, and it might surprise you:

Water Drainage:
The slight curve allows rainwater or condensation to drip off easily instead of pooling at the bottom of the grill, which helps prevent rust and prolongs the life of the metal.

Security with Style:
Curves can make a window grill stronger by distributing force more evenly if someone tries to push or bend it, while also giving it an aesthetically pleasing look instead of a harsh, boxy appearance.

Animal Safety:
In some designs, especially in homes with pets or small children, the curve at the bottom prevents accidental injury or small animals from getting trapped.

Architectural Tradition:
In certain regions, curved grills are part of traditional architectural design and are seen as a mark of craftsmanship, blending function and decoration.

So next time you notice a window grill with a curve, it’s not just for looks—it’s a smart design choice combining safety, durability, and style.