(光之穹頂; Guāng zhī qióngdǐng) is a public artwork in the Formosa Boulevard MRT Station. Created by Italian artist Narcissus Quagliata, it is the world's largest stained glass installation. The dome is divided into four sections: water, earth, light and fire. It also takes the form of a yin and yang symbol. An audio guide (available in several languages) can be borrowed from the KRTC Art Shop inside the station. It costs NT$30 and gives a half-hour narration of the key features of the artwork.