Typical tower photo. The big boxes hanging from the ceiling are
Tower Radar Displays, different from the radar displays in the
dark radar room below. Tower displays must be visible in the
presence of light. Notice the shades that are partially pulled down on
the opposite windows. They are usually raised or lowered just enough
to block out direct sun light, but hardly ever lowered completely until
forced to. They prefer an unfiltered look out the window at their traffic.
Photo above by Martyn Davies under Creative Common License