This is a big week for images of annular objects and I want to make my contribution from a less cutting-edge end of the spectrum: looking up a shaft from inside the Paris Catacombs. The rainy day at the other end of this portal means umbrellas obscure the sky.
Decaseconds 
[…] a catacombs’ portal to one with a bit more life: the back side of this clock face at the Musée d’Orsay is […]