It's purely aesthetical man. I can't believe a forum full of pot smokers can't simply look at the pipe and tell you that. I'm so disappointed in you guys. Sitting there looking at a perfectly normal spoon pipe (though it is a tight one) and saying *in my best arrogant retard voice* "well, if it joins the chamber, it must be a carb. blah blah blippity blappity bloo." "or maybe it's a secondary carb" ...so disappointed.