I briefly owned a Porsche design 909 pipe that was very thoughtfully designed and, I thought, beautiful, in a 60s streamlined kind of way. It had metal sheathing on the rim, which prevented scorching; parallel grooves around the bowl ostensibly to help radiate heat; a 9mm filter to reduce tar and moisture; and it used a synthetic material that made the tenon feel almost lubricated, and the stem comfortable to clench and impervious to chatter. For all that, I couldn't really enjoy the pipe. Although the metal rim got too hot to touch, the pipe itself smoked fine. I just found the pipe soulless (if a pipe can be said to have a soul). In any case, it was an example of a pipe that was designed from first principles, well executed and attractive to look at. It just never grabbed me as I thought it would.