For at least the last 3 days, the world has been divided on the answer.
In my honest opinion, the answer is neither. To me, it appears to be an engineered picture meant to work both ways, which it does very well, and no real cat was ever on these stairs.
Very cool! What do you think?
» [article][CNET] Professor explains whether cat is going up or down stairs. (No, he doesn’t! He hems and haws in a very scientific tone, LOL~)