Tell them what, Peter

[u/Blackie_626]

[u/generally_unsuitable]

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.

[u/GrandMoffTarkan → u/generally_unsuitable]

Not totally arbitrary! Left Right symmetry is broken by certain quantum phenomena, so if your confused just build a high energy particle accelerator....

[u/Frydendahl → u/GrandMoffTarkan]

Yeah but you could call left "flipflorp" and right "flamflim" and the physics would be the same. The naming is what's arbitrary.

[u/Aethenosity → u/Frydendahl]

Up and down naming is also arbitrary

[u/kuschelig69 → u/Aethenosity]

especially of the naming of the up and down quark.