Visualize economic cyclicality

A chart on Brian Shannon's excellent Alphatrends blog of technical analysis ("Successful Speculation Begins With Objective Observation") struck me as familiar this afternoon.
The S&P 500 during the last two bear markets looks like the Fed Funds rate.

You can easily imagine how unprecedented and ongoing efforts to pump liquidity into the system could already be setting the stage for the next leg up (or "bubble").