Segatoys special edition “Grand Pianist” miniature piano is a functional instrument – but each of the 88 keys are only 4mm wide. So it looks like you will have to play your epic rendition of “Chopsticks” with a stylus.
“…like a real piano, it delivers natural sound through the speaker when you press on the miniature key. Grand Pianist keeps more than 100 player-piano-mode tunes in its memory, and the keys will move according to the music. User can also play tunes by directly pressing on the keys. Every single material is carefully chosen and put together to finalize the perfect scale. An one of a kind electronic, beautifully crafted and with high quality sound.“
As you might have guessed, tiny Grand Pianos don’t come cheap – $549 at Audiocube.