If you look closely at his postcard, you will see that one can take away any of the elements and the artwork will still be able to stand tall. I see many sketches which rely on the addition of a second or even third medium to turn it into good art. It is an aspect I strive fro in my own art: the ability to draw a single line so that it draws on all elements of good art making to be able to stand on its own. Which brings me back to my firm belief: to do good art, one has to have a knowledge of drawing. Technique and the basic principles of drawing DO have a solid place in art. Albrecht's postcard is testament to my belief.
Have a look at the close-up to below see the lovely lost and found edges, a technique which seduces the eye of the viewer to "continue the lines and complete the drawing", a great way to get the viewer involved in a painting/drawing/sketch.
Read more of this course and his other work here.
Thank you for my beautiful postcard Albrecht.