Why does the Earth look flat from the ground, if it's a sphere?

Our planet is shaped like a big blue marble. But when we’re standing on the Earth’s surface, the ground looks pretty flat. So why doesn’t the Earth look round to us? We asked astrophysicist Ian Hall to help us find the answer. Got a question that you can’t wrap your head a-round? Send it to us at BrainsOn.org/contact, and we’ll answer it in no time flat! See omnystudio.com/listener for privacy information.