Positive & Negative Shapes: Often black and white, but colour can also be a positive.
Positive = Put
Negative = Nothing
Contour Line: The line edge or boundary that shows us the shape of something; a solid line; sometime continuous.
Blind Contour: Drawing a contour line, but observing the subject very carefully by looking ONLY at the object and not looking at your drawing until you are done.
When drawing in blind contour please remember that SUCCESS IS NOT REALISM!
Success is having sensitive lines with lots of attention to detail
Modified Blind Contour: Peeking at your paper a few times to orient your line placement.