Symmetry

This isn't qualitative enough for today's crowd but consider these charts:

SPX W
5/2015 H to 8/2015 L
Projected from 11/2015 H
Gave 1850 as a target - somewhat exceeded by price, but held on weekly close. 

Now I am doing the same thing from the 2/2016 L to 8/2016H, projected from the 11/2016L. This gave 2468 as a target - slightly exceeded by 2 weeks but still potentially in play.