It's called Chartres Blue. It is a blue that is unrivaled in any stained glass in the world. Just a 40 minute trip from Paris, The cathedral stands out as a medieval skyline on the french plains as you approach the town.
Gemini horoscope - Gemini zodiac sign, from the Cathedral d'Amiens, photo by Vassil. I rationalize that I don't believe in astrology as a "fortune telling tool." Yet I know way, way, way too much about it and reference signs in every day conversation.