One of Armour's cats, for example, sees the reflection of light from the TV on the opposite wall and paws at it for hours. "She leaps at glimmers of light from the chrome of a passing truck, and hunts tiny specs of dust as they fall through a beam of sunlight," Armour said. "Light and shadow transfix her, and it sometimes takes me a while to realize just what she's watching."
At times, your cat might suddenly be staring not at "ghosts" but at you ... which can be a little disconcerting. "If your cat is staring at you, owners are often encouraged to slowly move or even blink to send the message that you are not a threat," Barrack said. "But chances are, it's also out of love."