The blue hour comes from the French expression 'l'heure bleue', which refers to the period of twilight each morning and evening where there is neither full daylight nor complete darkness. The time is considered special because of the quality of the light at this time of day.
The blue hour is the gift of the day to the night. Different cultures celebrate the blue hour in their own special way. For many of us, it's the most beautiful hour of the day as it slowly draws its curtain and the evening begins.
It is the hour of transition when the indirect light of the evening colours the night sky. Nature's wonderful play of light is displayed. Every evening anew.
This is the spectacle that Mich Gerber interprets during his series of L'heure bleue' concerts. They have been taking place since a few years on special places on the water in summer time.