Japan's manhole covers have become the subject of books, photo books, Instagram accounts etc. Some of them we have also posted in this blog and this is one more, from Osaka, on the way to the castle. Its theme is, of course, the castle, its moat, a water bus doing the moat's rounds and some modern buildings in the vicinity.
(For a bigger version of this picture both in color and black and white, check my "Japan Arekore" set on Flickr).