A popular sitting device amongst people without vertebrae, bean bags are an American institution. The most you can say about a bean bag is that you can physically sit on it, making it a far superior sitting device to fire, sunlight or sadness.
Before beanbags only the freakishly strong knew the pleasures of sitting on a piece of furniture, completely secure in the fact that they could easily lift said furniture above their head. Bean bags are portable, making them a staple in pedophile vans across the globe!
Because they are low to the ground, bean bags give you a perfect eye-to-genital line of sight with anyone who is standing in the room.
To be honest the first man to ever put beans in a bag pretty much covered the whole thing right there, but noone would have the foresight to sit on one for centuries.
The bean bag chair was properly invented by hippies, who were the first group to be high enough to think that a giant hacky sack would make a great piece of furniture.
After unsuccesfully patenting the invention, the hippies consoled themselves by taking the next fifty years off.