Paris, France. Not far from Charles De Gaulle airport, this tunnel entrance is a work of art. However, at certain times of day with the sun's angle just so, while driving about the speed limit, the play of light-shadow-light-shadow on one's eyes is almost painful. Reminds me a bit of strobe lights from psychedelic light shows of the 60s without the slow-motion effect. Not an experience you want to have while driving. Good thing the sun's angle changes rather quickly, making the effect temporary. This photo was taken on a subsequent drive through the tunnel when light and shadows were more diffuse and the journey much calmer.