THANKS BOB!

What's the source of "theater of the mind", and "one man's opinion of moonlight"?

Thanks!

Young Girl Blues
Donovan

from Mellow Yelow

It's Saturday night, it feels like a Sunday in some ways.
If you had any sense you'd maybe go away for a few days.
Be that as it may, you can only say you are lonely,
You are but a young girl, working your way through the phonies.

Coffee on, milk gone, such a sad light in fading,
Yourself you touch, but not too much, you hear it's degrading.

The flowers on your stockings wilting away in the midnight,
The book you are reading is one man's opinion of moonlight.
Your skin is so white, you'd like maybe to go to bed soon,
Just closing your eyes, if you're to rise up before noon. (etc.)

I'm amused! I have the Donovan album, and from there was wondering where that phrase came from-many thanks for your time and effort-