Beg my pardon for straying off topic, but divito; how can you claim to be a nihilist and an existentialist?
Is it a joke, or are you clueless?
Anyway, the Earth IS flat. Because, I look out my window and it doesn't appear round (the degree to which it curves at that small area of the sphere is imperceivable to the human eye).
Just like my index finger is larger than my LCD monitor, because I can hold my index finger several millimetres away from my eyeball and it overlaps the monitor.
Also, the world is upside down. When I put my head between my legs the world appears upside down (well, relative to our common perception, with our head upright), it's just that we humans have our heads around the wrong way, so yeah.