Southmoor station

Southmoor station is an island platformed RTD light rail station in Denver, Colorado, United States. Operating as part of the E, F, and H Lines, the station was opened on November 17, 2006, and is operated by the Regional Transportation District. It is the southernmost station before the Interstate 225 branch splits from the Southeast Corridor and serves as a transfer station for each line.
The station features an interactive piece of public art entitled Harmonic Pass: Denver. Created by Christopher Janney, it features a mixture of light and sound throughout the pedestrian tunnel. Within each column are photoelectric sensors and an audio speaker. Also, a riddle is etched on plaques on both ends of the tunnel. If a person can decipher the riddle and trigger the columns in the pattern described, the tunnel will “dance” a pattern of light and sound in reply.

Wikipedia