This Is Why Some Window Grills Have a Curve at the Bottom – It’s Not Just for Looks

If you’ve ever walked through a city neighborhood or looked out your apartment window, you’ve probably noticed them.
Window grills — the metal bars that frame glass panes for safety.
But have you ever seen one with a gentle curve at the bottom?
Not straight. Not angular.
But slightly bowed, like a soft smile in steel?
At first glance, it looks like a design flourish — maybe an old-world touch, a decorative nod to vintage ironwork.
But there’s more to that curve than meets the eye.