A discussion on The Concave Earth

We have spoken about flat Earth we have talked about the hollow Earth we have even went as far as to talk about the holographic universe. But I do got to say I do not believe we have ever talked about the concave Earth theory. Never before have I ever spoke about it let alone even researched it. Let's dive deep into a mind-bending theory called the concave Earth. Let's do it Brains! It's Showtime.... It's Go Time...