As the upper sky and distant mountains appear blue, so a blue surface seems to retire from us.
But as we readily follow an agreeable object that flies from us, so we love to contemplate blue, not because it advances to us, but because it draws us after it.
Blue gives us an impression of cold, and thus, again, reminds us of shade. We have before spoken of its affinity with black.
Rooms which are hung with pure blue, appear in some degree larger, but at the same time empty and cold.
The appearance of objects seen through a blue glass is gloomy and melancholy.