
I have seen a lot of this work on the web and what I noticed was that the artists were generally quite self satisfied with their work. The project (assignment) is usually described as looking at a subject and making the drawing of the same without looking at the subject.  The number of assigned repetions vary.  I decided to do the project myself and being somewhat masochistic I decided to do thirty hours as recommended by one teacher.  I used a timer and tracker to keep myself honest and over 2 months have produced over 300 drawings . . .and racked up about 20 actual hours.  The project is difficult for me but rewarding as I have learned to see and appreciate minute details that I have always missed before.  I am much more patient in the looking aspects of drawing.
Further, I have realized that humans really only see in abstraction.  They take all the little abstract afferemena and organize it in their brains to produce a useful meaning.  Ya I know this is likely not a new finding.
I am posting a Blind Contour Drawing of a Geisha and a cat, taken from a historical drawing of the same, artist unknown.  I dont think there is enough resemblance to violate any copywrite . . . but well anyway.  As abstract as this is . . . it is beautiful to me.