1. It's easier to store the world's largest collection of disco records on the inside of a sphere. All the records can be stacked like records, in layers, making it easier to access the Bee Gees.
3. It's a giant pizza, and we're all just toppings. Pepperoni, mushrooms, extra cheese... the world is a delicious, saucy mess!
4. The world is flat, but with a hole, because we're all just a bunch of ants in a hole-y, ant-sized world.