[BurningFrog]

Sounds like something that might have had survival value during 50.000 years in a big nondescript landscape.

Yes, I'm making an evolutionary guess.

[soperj]

I believe they don't actually use left and right, but use the cardinal direction instead. So it's something they need to be constantly aware of. Ie: their kids song would go "Put your south hand in, put your south hand out.."