If you have a bowl made of gourd, then you have the ultimate bastardization of a reverse calabash...
as explained by dusk aboveWhat is the point of a coloring bowl?
Ah, I didn't see his post since I had not refreshed my page when I wrote mine. Thanks for bringing it to my attention. A very interesting concept indeed.as explained by dusk above
It allows the bowl of the pipe to act as a condensing chamber and for the oils to colour the pipe more evenly