Functionality is key. One of primary reasons I enjoy the looks of my car as much as I do is that every major design flourish is functional. The various holes/vents all actually provide or extract air in the name of cooling and/or aero. The font skirts/spats and ducktail in the rear? They produce measurable downforce. I’ll take this so far as to state that I find the Senna to be a good looking car, as I do a Renault Turbo 5, the 720S, the new Ford GT, etc.