That's pretty.
Strictly speaking a recognisable cauldron has legs (usually 3 - or 4) and a handle.
So that it can be carried, hung over the hearth, and placed over a fire with enough space underneath for the flames to heat up the contents inside (cooking). It usually also has a lid.
Though small ceramic accessory cauldrons don't usually.
South Africans use a cauldron for cooking (If they're more traditional - and/or perhaps can't afford the money to have a proper cooking stove) - very much like the "proverbial witches cauldron".
In East Africa - we call it a "Jiko" and it looks less cauldron-like and more like a contraption which has a drawer at the bottom to put hot coals in to heat the food in the container/pot that is placed over the top.
But of course really - a cauldron in magical/ritual terms - can be whatever container you like that to you, adequately symbolises it.
Cauldron, represents the 5th element - Spirit. (Or alternately, from some popular culture - depending on what sort of books you read - the magician in balance with, and in control of, the 4 elements. hopefully within hirself foremost!
).
When I get home I'll post you guys a photo of my cauldron.
(cast iron, about the size of a football - bought it from a Witchcraft shop in Glanstonbury England). I don't do incense often as I'm sensitive to scent. More often I'll use a mild essential oil in a burner for that. Or use or make an essential oil spray.
My cauldron is filled with rice - and I usually put a candle in it.