All humans are creatures of habit. It is ingrained in  their DNA and reinforced by society to such an extent that for most people it is an unconscious behavior.

I'm sure that if you write out your daily schedule there will be little deviation from week to week as far as what you do. If you expand that into a bigger cycle you will probably see weekly and monthly patterns in your behavior, and then finally life patterns. Hardship, success, plateaus, etc. Now apply that thinking to the market participants as a whole.

Now take that and graph it and basically you have technical analysis.