Don't you wish the earth were just a little smaller?
If it were smaller, then the horizon would slope away more sharply. If that angle were sharper, it might be possible to tilt one's head back, look straight up and see nothing but sky.
But I am still catching things in peripheral vision, and I'm not talking skyscrapers. So for optimal sky-viewing experience, the earth is not quite the ideal size. Not that I would ever complain about it! Just mentioning the fact.