There are several ways in which the different academic disciplines intertwine, but with the double-cone, the boundaries are very real and constrictive. I, for one, can't find many practical uses of it, whether in life or theory, and judging by history, no notable or even research-able figure in history ever has, either.
If you want to see some interesting tidbits of information I've managed to dig up from the pits of academia and the deepest chasms of the forbidden archives of the internet, you can visit either the page on ENGLISH APPLICATIONS OF THE DOUBLE CONE, or, if the yesteryear's contents are more your fancy, the page on HISTORICAL USES OF THE DOUBLE CONE. Either way, just be wary of where you're sitting, for spontaneous napping may occur.