Aye, indeed, it's not meant to be a scene of artistic action, more just a display of a semi-complex booleans and their families and whatnot. The "blue sky" you see, Eriosia, is actually the refraction of the glass. It occurs on all windows, only we dont' tend to notice it as being "fake" in real life, because we know it's real. The blur comes from Flaming Pear's "Melancholytron" filter, I love it but I suppose it's not for every image!