The Shanghai Index, Copper and Freeport McMoran (FCX) look to be forming descending triangle patterns. Bottom line to this pattern: a break of support suggests a decline the size of the triangle.
Crucial Support
The key to this patterns is the support line, which must hold, or sellers will step in. Commodities and the largest country in the world don't have much to brag about over the past few years, other than poor performance and relative weakness! If support breaks, you may hear traders boast, "we sent a signal ahead of time that the macro picture was about to slow down."
Support at this time is STILL IN PLACE.... support has NOT broken. I am point this out to give folks a chance to ponder portfolio construction ahead of time.