Happy Thursday Everybody! Here’s another one from one of my recent excursions to the Southwest. Warm evening light filling the keyhole at the Subway in Zion National Park. At the base of the slot a cool stream fills a set of turquoise pools. The cavern rocks form a semi circular tube with a thin section splitting open the roof. It’s an interesting effect that allows cool ambient light to illuminate the passageway while a simultaneous warm glow radiates into the cave opening (appearing to the right). What a great area to get out and explore!