The lack of haze in the atmosphere make the mountain look as if it was just down the street from the tree and clearing. Think about it, in our real world, distant objects are colored/distorted by haze in the atmosphere. The crystal clear atmosphere of the image  gives one the impression that those distant mountains are just a few minutes walks from the tree.

Didn't you know that beauty is in the eye of the beholder. That's why eyedrops and rose-colored glasses are needed.