Random ramblings

An excerpt from a conversation.

Q. why is the sky up?

A. the sky is up because there is nothing there. consider a scenario: you look toward the horizon and see a mountain. if the mountain wasn't there, you would be seeing black space at night and blue during the day, the blue being the light from the sun being diffracted through the atmosphere, thus giving us a blue "sky". if the mountain was taller, we would see less "sky". if there is a cloud directly above you, stretching for miles, you could only see the sky on the sides, toward the horizon. if this was a perpetual state, the question would be "why is the sky around?". so, the sky is not a real object, but rather the lack of objects between the observer and the furthest visible point. due to pollution, light diffraction, interstellar particles and low sensitivity of the unaided human eye, the "sky" appears during the day and seemingly blocks out most objects that are outside earth's atmosphere, with the exception of the sun, the moon and some bright stars/planets. back to the question at hand, the sky is up because there are very few objects "up" to block the "sky". certainly there are more objects on the ground around us, and slightly rising, as may be the case in a crowded metropolis.