Similar Patterns of Inefficient "Vessel" Formation. Top shows normal (A) versus tumor-elicited (B) blood vessel pattern, illustrating differences in design efficiency. Photomicrograph by L. Heuser and R. Ackland, University of Louisville School of Medicine. Bottom shows traditional development with street grid pattern, compared to sprawl development. The possible pathways and distance from location "A" to location "B" is indicative of differences in distribution efficiency. Satellite images courtesy of Google 2008 Tele Atlas.