A bout of shingles curbed my retirement activity of golf and any other physical activity. A partially filled notebook, about 10 years old became my companion.  In a short period of time, I became addicted, realized that I liked sketching and within a few months had many sketch books full of such drawings.
 
They were from many sources, just anything that struck me at the moment.  I realize now that I was teaching myself the basics off all art.  Subsequently I became interested in sculpting and that led to painting.
 
I still have much to learn and less time to get to levels I want, but if nothing else, I have proven to myself that no ambition is beyond a good effort.