Seeing the bottom of the bowl does NOT mean it's empty.
You forgot the revengeful knocking random stuff off the [insert surface here]
Oh, my cat is like a snake gliding through water. She never knocks anything over. She just drums on my head. And knows where my face is if I try to cover my head. My sister's cat on the other hand is a truck. He just plows through everything.
ah.. the cats I know - do glide around things yes, but they look directly at you, and shove things off the shelf.. or knock things off while you sleep.