"A nightingale floor": unique invention Japan XVII century, symbol of technical progress and culture!

To Japan the XVII century the unique decision for ensuring safety in houses of rich families and emperors - "a nightingale floor" was invented. It were metal brackets, established under a floor in such a way that at each step made the sounds reminding singing of a bird. Thus, it was impossible to pass on such floor silently. The idea of creation of "a nightingale floor" arose from need of protection against attacks. Such floors were established in the corridors conducting to rooms of emperors, and also in houses of rich families. And if someone tried to creep on tiptoe, only increased pressure on...