I like that idea. The sky is blank and blue, effectively out of focus. Fields and clouds are usually as well. I think they help the brain be like "hmmm I'm no

I like that idea. The sky is blank and blue, effectively out of focus. Fields and clouds are usually as well. I think they help the brain be like "hmmm I'm not seeing distinct lines and edges here. Maybe I should encourage the eye to be better at looking into distances" This is the exact opposite of what happens in front of a computer screen. The brain is likely, 'whoah this is too much contrast. Maybe I'm too good at seeing into the distance. Let's fix that by making the eyeball longer'