Mezzotints by Nobuo Okawa:-

"Titles instantly limit the experience of the viewer. I prefer to give numbers to my work.

I cannot explain my work in words; if I could, I would have written a piece of prose instead.

When the result is good I can never remember how I did it, but if it is inferior I know exactly what was going through my mind while I was making it.
"

Nobuo Okawa