According to the teacher of my art class, 'mud' does not refer to a colour, rather a colour that you didn't intend.
It seems that most of my adult life has been spent in mud, doing things and making decisions that took me somewhere unintended. I suppose that is the advantage of not having clear ambitions. I can't recall ever having long-term goals. That doesn't mean I was unmotivated. Whatever I was doing at any time, I threw myself into - teaching, travelling, being in love.
This art class is merely the most recent. I don't know whether this will be something that becomes a long-term activity, I know that I am enjoying it now.
There are definite advantages to living in mud. You don't get disappointed and there is always something new to discover. I recently read an article about Cindy Sherman in Vanity Fair and she said: "I had no idea I would really become an artist. I never would have thought I'd be doing this for 35 years." 35 years in mud has resulted in some amazing work.
I intend to stay in the mud. I hope that it spreads and more people see the beauty in it.