We love cats because they're cute, cuddly and act like they're from another planet, and we know how smart they are so we assume their strange behavior is a sign of boredom and restlessness.
But, as this animated TED-Ed lesson by Tony Buffington shows, cat behaviors such as pouncing on stuff, exploring and squeezing into tight spaces, clawing and climbing up as high as they can go are all instinctual.
Tony answered many cat questions in this video, but I still don't know why my cat is scared of his own reflection and his own shadow...maybe cats are instinctual and weird?