Researchers with Swedish packaging company SCA have built a cardboard only piano that sounds almost like a real one.

Integrated circuits are pressed onto paper instead of silicon chips or circuit boards. It’s based on technology developed to make paper products that change color or include radio-frequency tags for inventory control.

When one of the 88 keys is pressed, the circuit underneath sends a signal to an external loudspeaker, which plays the adequate sound.

For the moment, the prototypes are only used to demonstrate the development of next-generation printing techniques.

Read Silicon Valley.