When I snapped a picture of David Adickes' latest installation, on I-10 just north of downtown, I assumed (Adickes being a Presidential-sculpture guy and all) that all four of the giant heads on display belonged to US Presidents. I see now that this was a wrong assumption. Page 53 of the May edition of 002 Magazine has the explanation:
These four men are nicknamed "Mount Rush Hour," Adickes tells us, "but its real title is Tribute to American Statesmanship. I define a statesman as someone who cares more for the country than his/her own political career. And Lawd knows, we need some. The four figures: Washington, Lincoln, Houston, and Stephen F. Austin were truly statesmen."