This project is a fake 3d aquarium. Individuals can use their hands to manipulate the movement of fish and other creatures on the screen by leap motion. The screen is pyramid-like, using pepper’s ghost to mimic a three dimension world that the images can be shown inside it. This project also involves music visualization as particle systems on the screen will be changed as the song plays along.The fish in this starry aquarium can swim slowly or quickly according to the number of the fingers on the screen, in which people can manipulate the speed of fish and other creature in a way they want.