Why should that be better? I've read that and had a myriad of possible visualizations, beginning with some billiard ball on a pool table(which of them?), over some larger ball on a garden table, to tennis balls(which color? they come in neon yellow, orange, pink and even green!), and whatnot else. It only makes sense to abstract all the possibilities out, and ask how the EFFING EFF should I know?!