It’s what every house needs, but no one has done right since the construction of Nijo Castle in Kyoto. Constructed in 1626 as a residence for the Tokugawa Shogun, Nijo Castle is equipped with uguisubari, or Nightingale flooring, that chirps when walked on. Visitors walk through the corridors looking in on the immaculate tatami rooms once used by the Imperial Court, admiring the murals and the woodcarving, and all the while the enormous cyprus floorboards creak beneath their their feet. To dispel the magic, the gigantic nails used in the flooring are designed to rub against clamps and sound like birds in case an assassin should try to sneak along the castle halls. The softer ninjas walk, the louder they creak. This bad cat was not supposed to use a camera in the castle, but here is a YouTube video of the floor in action: http://www.youtube.com/watch?v=jJThECzA1bc&feature=related
This post is also featured on the Japan page.