Separate sunlight from the blue reflection of the sky. The warm sunlight flows over the objects and forms in the painting. The sky reflects down, i.e. on the ground, and leaves some blue behind. Both sunlight and the reflection of the sky are affected by the time of day, season, weather, etc. There is also reflections from close objects into the shadows of other objects. Usually the tops of objects are affected by the cool blue of the sky. The bottoms of objects are affected by the warm ground.
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