I do seem to have the best job in the world. Go to nice places, sit down for an hour, and enjoy the warmth.
Its a good life. Even if I do have to balance on a precarious three legged stool. Lucky for you I can't intellectualise about my work, I don't have complex reasons for doing it, and I often don't know why I draw a certain subject.
And do you know what? That doesn't bother me. I just like the colours, the overlay of man made structures, the accidents of architecture over time.
But I do like my paints, and the papers I use, and the pens, all chosen carefully after years of blots and scratches and nib bending.