Oil lamps are well-known and still made, in lots of different styles and materials now.
The first one I heard of belonged to some chap called Aladdin, in a fairy story.

I'd imagine Provençale refers to countryside rather than the region of France, given how widespread they are.
Hollow balls would be a lot cheaper to make, as you say, and probably not suffer from damage so much.
If they were very top-heavy, they'd fall over easily.
Lace makers did not earn much.
