An example of a place whose elevators use only the color convention to differentiate between directions is the Museum of Contemporary Art in Chicago , where a single circle can be made to light up green for `` up '' and red for `` down '' .
An example of a place whose elevators use only the color convention to differentiate between directions is the Museum of Contemporary Art in Chicago , where a single circle can be made to light up green for `` up '' and red for `` down . ''