L’heure Bleue is that hour of twilight and magic in early morning and again in the early evening– when the world appears to be blue during the transition between daylight and the night sky.
Below are a few links to posts about l’heure bleue on my Studio Thoughts blog .
https://studiothoughts.wordpress.com/2014/12/23/lheure-bleue/
https://studiothoughts.wordpress.com/2017/04/16/enchanting-lheure-bleue/
https://studiothoughts.wordpress.com/2017/01/27/winter-morning/