1) take the center of a major swing
2) mesure back and
3) project it forward.
Observe how price is acting/reaction at the R-Lines.
This is the same principle like: "If you push to a wall, the wall is pushing back."
On my new Blog-Post for registered FreeFTG members, I'm going into details about this technique that stem from Newtons 3rd law of motion, and adapted to the charts by Dr . W. Babson, who made a fortune and started the Babson Collage.
It pays out to know more then just common trading knowledge...
TradingView Blog: http://www.forktrading.com/tradingview-blog