Binary pencil and ink drawing

"Binary" 14 x 11 inches, pencil, Pitt artist pen, 100% cotton bristol board.
“Binary” 14 x 11 inches, pencil, Pitt artist pen, 100% cotton bristol board.

You can tell by the title “Binary” I’ve been reading Burnham’s Celestial Handbook again. This drawing is pencil and Pitt Artist pen in Cobalt Green, which looks more like aqua or teal to me. (sold)