I found this at my grandmother’s house: made entirely of glass with narrowed openings all around the perimeter. What is it?

A Glass Mystery at Grandmother’s House: Unveiling the Past
At my grandmother’s house, I stumbled upon an object that caught my eye—a peculiar, entirely glass-made item with small, narrow openings scattered around its perimeter. Its smooth surface and simple design lacked any mechanical complexity, yet it exuded a charm that hinted at a deeper purpose. It wasn’t just decoration—it had a story, a history, and a mystery to unravel.

I couldn’t help but wonder: What was it for?