Blue luminous shapes over the Paris region in Cachan

Summary

A witness reported by email the sighting of bluish, roughly round luminous shapes in a cloudy sky over the Cachan area, accompanied by photographs. No other witnesses came forward. The images strongly suggest ground-based lighting reflected off the cloud layer. The Paris region has numerous powerful spotlights illuminating monuments, public buildings, and nightlife venues whose beams can blend into an overcast sky. The observer's exact location and viewing direction were unknown, but the low strangeness of the case made further investigation unnecessary.