How Japanese manhole covers are made

I saw this over at Kottke. Super cool.

I giggled a little because when I first moved to Chicago back in 1999, I moved to Wrigleyville which neighbors Boys Town. Walking out our front door to the 100 yards to the west, put you right in Wrigleyville bars. Going east 100 yards, put you in Boys Town. On that very corner was a bar called “The Manhole.” For a country bumpkin from NC, that was novelty. Like, “Look at that bar,” tee hee tee.