There is also a Japanese version of Feng Shui known as kasō [ja][10] or literally "house physiognomy". Closely connected is the Yin-yang path or Onmyōdō, and its concepts such as katatagae ["direction changing"] also known as kataimi,[11] which was widely practiced by nobles in the Heian period. A widely known taboo (kitamakura [ja]) advises against sleeping with your head faced north,[12] though it is doubtful if anyone now seriously heeds this prohibition.[12]