flat surface, you'd never get any closer or further apart But if you're on a sphere and you and your friends start walking perfectly straight you think you're walking parallel paths at first But you'd slowly notice you and your
evianne friend getting closer together until your paths would eventually cross Even though you thought you're walking straight the entire time and this is something that happens when you have that positive curvature For another thing you'd see on a flat surface is that if you started walking perfectly straight then made a right turn Walk the same distance and repeated this it would take three turns before you got back to your original spot But if you're on a sphere it'd be possible for you to make two right angle turns before returning to your original position This wouldn't
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