> It would be neat to put windows on the floor. You’re most interested in looking down anyway.

I don't think so. Looking down isn't what people look out the windows at, it's the horizon. Looking straight down would be generally frightening, sickening, to many people... whereas the horizon is steady and calming.

But either way, once you're above the clouds, windows are OK but kinda useless. View doesn't change much up there, or at night!