If you look at the earth, expecting to see roundness, everything will look round to you. The horizon (which is demonstrably Flat) will look curved. You will put your faith in every computer generated image of space that gets produced by NASA Movie Studios. You assume the earth is round, and interpret all physical evidence on the basis of that assumption.
When you step back and take a hard look at reality, uninformed by your biases, reality suddenly becomes free, and anything is possible so long as your senses can confirm it.
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So round Earth is just a presumption but flat Earth is fact? Which there is no evidence of the Earth being flat but there is plenty of footage of a round Earth. Well if round Earthers are supposed to open their minds to possibility of a flat earth, shouldn't it then be the same for the flat Earthers, which you're showing a complete disregard for. If the Earth is flat why is Australia called down under, shouldn't it be called on the edge? [spoiler] checkmate[/spoiler]