Boing Boing: Aymara people's "reversed" concept of time

Boing Boing: Aymara people's "reversed" concept of time

Link to a summary of a linguistics article wherein it is written that a certain indigenous group in the Andes waves over their shoulders to indicate future plans, and points forward to describe the past. Can you imagine how confusing it would be to teach tenses in the classroom using body language as an aid?