Comment by probably_wrong
5 hours ago
I'm going to disagree with your law of "conservation of filth" on the grounds that it's pushing things too far. Whatever amount of feces comes into your system via walking downtown on a regular day and then bringing the shoes inside pales in comparison to the amount of fecal matter that enters via your toothbrush if you keep it in the bathroom. At some point a small amount of dirt is just fine, as evidenced by my immune system not even visibly reacting whenever I pick up and eat something that fell on the floor (as long as I follow the five-seconds rule). And people do go out to restaurants or, even worse, picnics, where all that separates their food from a much filthier surface is a piece of cloth.
I'm not going to say that every type of floor is to be walked on, with rugs and tatami mats being perfect counter-examples. But if a five-star restaurant doesn't ask me to take my shoes off (not evening Japan, AFAIK) then keeping them on is, from a sanitary point of view, probably okay.
The toothbrush analogy is weird, and untrue in most cases. And regardless, just one time stepping in crap, would make up for a lifetime of a few molecules hitting a brush at random intervals.
And of course, toothpaste is a cleaner, so it's not relevant.
But I find this all amusing, because wherever you take your shoes off? That's where all this supposed crap sits from all these shoes left outside. Which means you are walking in your socks in that area, after shoe removal, and entering the house.
So unless you levitate out of that area, your feet are still covered in this supposed crap.
The shoe rule in Japan stems from damaging floors. And checking your feet, shoes or not, is just prudent. But your feet or clean looking shoes?
Equally dirty.
Of course one should not put the feet down where the shoes are stored.
So do you levitate from the place you remove your shoes?