Check out the art of Sun-Chang Lo.
http://sunchanglo.com/
I had the pleasure of working with him at the Apple Store recently and was enchanted by his work. Yesterday he gifted me a published book of his line drawings 'Metropolis: An Omni Vision'. The drawings were created spontaneously on the streets of Chinatown NY, Hong Kong and cities across China. It is mesmerizing and staggering work.
In his own words:
"In fact, my drawing process in characterized by a liberation of the mind and a lack of premeditated designs. During the actual execution, however, habits dictate discipline and forbearance while intuition propels logic and composition. Every move seems to gravitate around the central theme of balance and symmetry. Sometimes, in a spur of the moment, I tend to improvise freely by injecting decorative motifs and life's symbols, resulting in a spectacle of multiplicity and vitality."
Sun-chang Lo