Interesting Analysis by Art Cashin: Dow Trapped in 17-Year Cycle

Art Cashin came on this morning at his usual time slot on CNBC and made an interesting analysis. He said that the Dow is trapped in a 17 year cycle.

Between 1982 and 2000, anything you threw at it, would go up (he uses the analogy of darts). Side note, how does this theory play with the crash of 1987 and the bear markets of the early 1990's?

He believes that we may be on the other side now, where the markets may go lower.