Polaris appears (almost) stationary because it is very close to the celestial north pole. And that is what makes it unique: it is the one point at which viewpoints converge, from all around the (northern half of the) globe, because it corresponds to the axis of rotation. In the northern hemisphere, if you point a camera northwards and angle it upwards at the same angle as your latitude, it will always point to the same spot in the sky. That's what the celestial north pole *is*! Get yourself a globe and you can confirm this for yourself - however the globe rotates, the camera will always be pointing "straight up" in this set-up. In other words, the camera direction is parallel no matter where in the northern hemisphere it is, or where in the rotation.