Enlarge / Can you spot the urinal design with the optimal splash-reducing angle? It's the one second from right. (credit: Mia Shi/University of Waterloo) Scientists at the University of Waterloo have determined the optimal design for a splash-free urinal: a tall, slender porcelain structure with curves reminiscent of a nautilus shell, playfully dubbed the "Nauti-loo." That's good news for men tired of having urine splash onto their pants and shoes—and for the poor souls who have to regularly clean up all the splatter.