Even though they’re right under our car tires and sometimes our feet, it’s not very often that we notice the manhole covers that dot our city streets. These prolific round disks of metal hide the subterranean infrastructure of the world, allowing access to our sewers, fire-hydrants and subways, but they never really become obvious until they’re belching white steam in the cold winter months. Most of the manhole covers we see are bland slabs of metal with a manufacturers name embossed on the top, but the examples we bring you today go a long ways towards making these ubiquitous objects something to admire and maybe even call art. [Read more...]