The PLEK Open String Box uses a stroboscope-effect to make the vibration of a string visible, in slow motion.

This strobe was originally designed by Gerd Anke to investigate the optimal playability on a guitar. To understand how a real string moves was one of the main keys leading to the PLEK concept of the ideal fingerboard relief, dependent on the instruments, the strings and the players spec's.

Watch the full video at Youtube:

PLEK Open String Box (stroboscope)