If you consider the first 360 degrees of a sine wave (like a rounded capital italic N that has been tilted just a bit to the right), you will notice that is starts at zero, goes up in a hill-like way, peaks, descends below where it started in a valley-like way, bottoms out, and then returns to the same level at which it began but yet farther along. Were one walking on this curve, one would have to make effort to climb up the hill. One would then have a spectacular view and a great sense of accomplishment. One might then try to keep walking up to get more of this, but end up sliding down the
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