Escalator

Escalators are moving staircases. Often found in malls, office buildings, and government centers. Airports have moving sidewalks which are flat escalators.

Like conventional stairs, a great place to catch a glimpse of an upskirt. However, unlike stairs, the viewer and viewee are not moving. The upskirt view remains constant.

Escalators also make a wonderful place for flashing. The flasher is moving without having to move themselves.