Despite it's best attempts to swallow the practices of an ancient culture and spit out SUV's and apple pie, Westernization has lost. Perhaps lost is too concrete a word. Rather, the Japanese took the things that benefited them most and merged them with what was already working. One of the best places to see evidence of this is in the Japanese home.
The first thing you'd notice upon being invited to a typical Japanese house is the presence of what's referred to as genkan. Genkan are basically a place for you to remove your shoes and put on a pair of house slippers before you enter the main home. The primary purpose is to prevent muddy or otherwise dirty shoes from tracking little goodies all over the place, but many believe that there's a psychological purpose as well. When you walk into the home, remove your shoes and then step up into the space, you become a little bit aware of the fact that you are a guest in someones private home. Ideally your behavior would reflect this new-found insight. Ideally.
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Oh, and don't worry if you find yourself invited to dinner but you're without your own set of house slippers. Most homeowners will have slippers at the ready for guests. However, if you have big ol' feet (or feet that are particularly...um...pungent) you may want to hurry out and buy a pair your own. Just make sure the socks you're wearing come from the same matched set.
Or, if you insist on wearing mismatched socks, at least make sure they're artfully mismatched.