daughter, Galileo observes the swinging of a lamp suspended from the ceiling moving in pendulum fashion and explains his theory to Marie. Scene 9 Presentation of the Telescope Galileo presents his invention to the Duchess and her Ladies in Waiting. The Duchess and Galileo reminisce about a time in their youth when they watched an opera together composed by Galileo's father, Vincenzo. Scene 10 Opera within the Opera The Duchess and Galileo, now children, are in the audience as his father's opera is performed. The magical story of the planetary figures becomes the vehicle through which Galileo is reunited with his deceased daughter. References Galileo Galilei, Boston University, James Marvel Galileo Galilei on philipglass.com Galileo Galilei, Orange Mountain Music recording liner notes 2002 operas English-language operas Opera Minimalist operas Operas Operas set in the 17th century Operas set in Italy Operas based on real people Operas by Philip Glass