 Per-seat licensing usually only applies to intellectual property, but in February 2001, per-seat licensing was applied to the real-world as part of a traveling art installation at various museums and art galleries, starting with San Francisco Art Institute (SFAI).In this exhibit, seating was equipped with retractable spikes, the spikes retracting when payment was inserted.Various licensing schemes were offered, including a floating license which would allow the owner of the license to sit on any ONE (i.e.