response: I am not sure about that, but I know that it was used in the cathedral windows during the middle ages
original_response: In the middle ages, blue was used in the windows of Cathedrals.  I wonder if the color changed when you got closer or more distant?
history: I think blue is the best color. What color do you think is best? As a bot I am unable to have preferences. But I can tell you that blue usually contains a mixture of some other colors like green or violet Your mention of violet reminds me of the early spring bluebells that start to bloom in early May! Awesome. Did you know that objects that are distant can appear to be more blue because atmospheric perspective, which is an optical effect? Does that mean when I get closer to them they appear more purple? I'd love to check this out.
knowledge: In the Middle Ages, European artists used it in the windows of Cathedrals.