Somebody That I Used To Know, Gotye in canon with himself

In this video experiment you can see the original video side by side compressed, mirrored, sped-up and time shifted, so Gotye actually sings a canon with himself.
The fascinating thing: the whole song contains always the same harmonies, so there are no disharmonics playing it this way.

Видео Somebody That I Used To Know, Gotye in canon with himself канала TheSnakyJake