Modern car styling trends seem to have resulted in headlights getting narrower and longer. In some cases the bulbs and reflectors have to be mounted vertically instead of horizontally. Older cars seemed to rely on horizontal lights in square or simple round lenses. As manufacturing processes have evolved more interesting shapes can be produced and tied into the cars lines more accurately. We expect to see a revival soon in the double and quad round headlights soon but for now we get to enjoy some variety.