For example, if I put a ball on it at the bottom right hand corner (in the image) would it find its way to the middle (without assistance)?
A filter of some sort?
So messy 'things' are added to the channel and fill it up to form a spiral shape? I say messy because you wrote earlier that after it was used for its correct purpose you wouldn't want to use it for anything else.
Correct and something happens to those things in it.
One has to presume that the "things" are cooked (as the item gets hot). It's not a pretzel maker is it?
The "things" also change their form.
A marshmallow toaster?
Nope.
Another clue, no actual food items go in it, though it is used in food preparation.
Does that mean you've figured it out?