Earlier I was at the gym, and noticed as is often the case, that in the men's room, there is one urinal that is lower on the wall than all the others. Now I wonder why not just have ALL the urinals lower? Why bother having two different heights? Seems to me that the lower urinal works just as well (gravity, you know). In fact, I am here now asserting that the lower urinal is superior to the higher one. The higher one, as is well known, encourages horizontal streamage, which results in what the experts call "splash-back". The lower urinal engages a downward arc, making a smaller angle to the wall, thereby reducing splash-back (diagram intentionally not attached).