Oh man, does this bring back memories. We live in a house that has translucent panels on all the interior doors. In the morning, light would shine from the building next door through a window and onto the panel on the door for our bedroom. Our cat, now departed, would sit adjacent to the door, and wait for us to get up and give her the morning meal. Because of the light coming through the window her silhouette was there every morning. We called it the Alfred Hitchcat effect. Miss that cat. Give your cat an extra squeeze for me.