From Japan Update 5/1/14: This exhibit at the Okinawa Prefectural Museum ends on 11 May 2014. Here’s more from the article:
The sanshin program takes visitors through how the sanshin has changed its form from the Chinese three-string instrument, which made its way to the Ryukyu Kingdom in the 15th century, where it has become the most typical Okinawan instrument. Visitors will see the world of the sanshin as a beautiful piece of art, as a mysterious sounding instrument, and how its music invokes memories of Okinawa.
The following photos of sanshin are not from the exhibit. They’re included here as examples of sanshin.