Interactive Voice Piano is a visual-interactive instrument that creates sensuous graphic motion by tapping the MIDI keyboard-like array of hexagonal grids. Each grid individually represents each of the music scale(e.g., Do, Re, Mi, Fa, Sol, La, and Si), and the synthesized voice MIDI data of the scale are coded on the grid in which the pressure sensors are embedded. So, when the user tapping the grid as playing the piano, the artifact connected with a speaker, Arduino, projector, and laptop makes quite an exotic mixture of digital voice sound.