Any time someone stops and wants to know what you're doing--or looks at what you're doing--they'll look at your drawing, and then they'll look up at what you're sketching. . . .Chances are pretty good they've never seen that building exactly that way.  You're helping them appreciate their city. They're becoming more aware. That builds civic pride. Civic pride builds advocacy for a great urban environment.
-----James Richards, Essential Techniques for Sketching the Energy of Places.*

*I generally enroll in Craftsy classes only when they're offered at a good sale price, $19.99 or lower, which seems to occur randomly and around certain holidays--sometimes through their Facebook feed.