This is an extremely weird concept, non euclidian geometry. The maker had to build a custom engine to do it. But it is fascinating anyways. I don’t know what the practical applications are, it is just enjoyable and super interesting.
https://www.youtube.com/watch?v=kEB11PQ9Eo8
And an inverted sphere world here video here https://www.youtube.com/watch?v=yY9GAyJtuJ0
And his code can be found here on github
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