In the context of Kendall Band, explain the Kepler of the Sculpture.
The Kepler section is named for Johannes Kepler, a 17th-century German mathematician, astronomer, and astrologer. This instrument features a 125-pound (57 kg), 55-inch (1,400 mm), metal ring that plays an F♯ when struck. This note creates a harmonic perfect fifth with the tones sounded by Pythagoras. The ring plays this note when a handle on either subway platform is manipulated, which in turn ratchets a hammer upward until it falls and strikes the ring. After the ring is struck, it will continue to hum for five minutes.
F♯ Johannes Kepler perfect fifth astronomer Pythagoras astrologer mathematician