For about 15 years, Michael Eck has been thinking about threes. Things that come in threes. Now he combines that esoteric interest with his attachment to the Internet by creating what he hopes will be the book with the most authors ever (a lot more than three, anyway).
He suggests that in our minds we break concepts into three parts to understand whatever it is we are thinking about. We use threes to define systems. We use the third or middle point with regard to the extremes to define a point of view. Yadda yadda yadda.