Tops occurred about every seven years. Tops were usually rounded, followed by intense drops.
Tops were approximately Aug. 1987, Jan. 1994, March 2000, Oct. 2007, and May 2015.
Once the S&P broke below the red up-trending support lines in 2000, 2007, and (probably) in 2015, the rally was over and large corrections occurred.
The next large move in the S&P looks like it should be, based on history, a substantial correction to the 600 – 1,400 range.