Gravity is just a random natural process to pick for your point. You could just as easily say “bottom to top is natural because that’s the direction trees grow”.
It’s all arbitrary.
It’s all arbitrary.
Writing is done by people and people are almost always subject to gravity. It's one of the 4 fundamental forces. Energy minimization is not an arbitrary selection criteria, it's central to the fitness/design of all living things.
Others have made a possibly more relevant point - in one direction, your arm/hand will block what you have already written.
I agree human mechanics is likely the reason people tend to write down rather than up though. But I’d say it’s more about our muscles, we’re stronger pulling our arms in than pushing them out. But I’m no expert so would never claim confidence in my assumption there.
is this a contrarian impulse or an anti-contrarian impulse?
A green flag for me that someone might be an expert is when their attitude towards answering a questions has that “it depends” energy.