A world with no up nor down

What would you do, if tomorrow, you found out that the world that we all think that we know turned out to be false? What if the story that you have been spoonfed turns out to not exist? Imagine a world with neither up nor down. this is the world of astronauts. this is the world that we live in. to a certain extent, the flat earthers are correct. Their perspective is self-consistent, and is it not true that a curved surface appears to be a line close up? Why do we call one ☝ direction up or down? Who knows? are people in space actually moving?

 https://www.chess.com/forum/view/general/chess-in-art2?page=15
https://stephshaw92.wordpress.com/2013/03/19/rendered-chess-sets-for-poster-ideas/glasses-3/#main
http://www.chess-museum.com/modern-and-modernist---special-show.html