On this photo your focus starts in the top left corner then it follows the desk down to the right middle side of the page. Then it moves diagonally up the key from the bottom and it leaves your eye at the top of the key and at ends on the staple. The weight on the page is on the right corner down because the black door in the background is darker and when it comes down it is out of focus. On the left the light is reflecting on the key and the table which makes this side of the photo lighter. This photo is radial cause it your eye starts in one place and just keeps moving throughout the page and doesn't really stop.