Virtual reality has also entered the world of entertainment. In japan, a young singer named Hatsune Mikuone has become a hit. Miku is actually a 3-D hologram of a pop star. She's sixteen years old, and she has long pigtails and large eyes. Miku's voice is recorded on a synthesizer called "Vocaloid." She has performed "live" at stadiums all over japan. Crowds of fans wave glowing sticks and sing along to "World Is Mine.