Quarter-Century Crud

Tokyo arcades are grimy. But think about it:

If you tied a white sports sock to a rock in a stream, so that the water flowed through it, and left it there for 25 years, then took it out and saw only a few faint lines of brownish yellow, you would conclude that the stream was almost perfectly clean.

And so it is that Club Sega's pale grimy streaks are in fact testament to the cleanliness of the metropolis.

But would you wear that sock, though?