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Exactly, i don't understand what it means either, but it's the illustration put in all derivations for the force of the surface tension, it is in the context of surface tension
This was very helpful, thank you. So we can say that this change of direction is due to the change of perspective by 180 degrees - me VS person standing in front of me; looking down the apple VS looking up -. Now, what would a person see who is standing, say 90 degrees to the right relative to me, in terms of rotation of the object clockwise or counterclockwise? And would it make a difference if this person was standing still 90 degrees but to my left?
