At the Time-Based Art Festival in Portland, from top: A collaboration by Seattleites Zoe Scofield and Juniper Shuey; Holcombe Waller; "Gatz" by Elevator Repair Service; and Nature Theater of Oklahoma...
Three private companies — Spin, ofo and LimeBike — have dropped 9,000 easily rentable two-wheelers onto our streets, placing us firmly at the forefront of American cities with dockless bike-share...