Why SP 500 and Nat Gas Look Alike

It kept popping up over the summer, " this chart reminds me of the natty".  What could the SP500 / equities generally,  have in common with the Natural Gas chart structure? Could be an ABC structure and what I think of as a symmetrical or Rorschach look.

 Nat Gas 25 yr. Chart

 SP500 5 yr

click to enlarge

The SP500 is a little asymmetrical at the moment but so was the Natty at different points. 

The main takeaway is the strong potential for an abc structure for equities over the long term as we go forward into the bear market of (likely) Grand SuperCycle Degree. 

Pls see The Equities Problem from April 2

SP500 3 mo. Chart