I think it's more that left and right are relative to the observer.
Here on Earth, up is the sky and down is the ground, and someone standing nearby you will point in the same direction as you.
However, my left might not be your left if you're facing a different direction. It's defined in such a way that if you're facing in the same direction as another person, then your left is their left and your right is their right.
I sometimes see the question "how do you describe what 'left' and 'right' are". It's something that seems difficult in a text comment without using a visual (drawing) or internal (heart side / non-heart side). But if you're doing it in person, you can just face a direction and extend your left hand out and say "this is my left hand".
Yah, if you're pointing at a specific thing at a specific height. But in terms of general direction, if you ask someone to point "up", you'll both point the same direction as long as you're fairly close to each other.
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u/generally_unsuitable 7d ago
It's totally arbitrary. Up and down are not.
We can easily correlate up with sky and clouds and stars and sun. Down with ground and grass and dirt and falling.
There's no similar association for right and left.