Charts mean something in every aspect of psychological behavior. I recommend "Investment Psychology Explained" by Martin J. Pring. It is a fascinating book that goes through the various bubbles (including the Tulip bubble and South Sea bubble. Charts are nothing more than a snapshot of human psychology. Support and resistance levels a snapshot of where buyers and sellers loom. Technical analysis has come a very long way in the financial markets in the last 40 years with the advance of technology.