Ever seen a billion dollars up close? Run your hands over it, or your eyes. Slowly.
Even when it's in hundreds, it fills a room.
You can make a room out of it. Stack it up, make walls, a roof.
Maybe even live in it. But it would make more sense to buy a place with it big enough for what's left over and you to fit comfortably.
It doesn't take much. You'd barely miss that little bit at all.
And it wouldn't miss you. A billion dollars doesn't care.
It just sits there. In a room. Doing absolutely nothing.