The Ravenclaw common room and dormitories are located in Ravenclaw Tower on the west side of the castle. Students enter through a door with an bronze eagle-shaped knocker. The knocker asks a question of anyone who knocks on it and opens the door when the question is answered correctly. If the riddle is especially difficult, large groups of students may congregate outside the door as they try to figure it out.

The common room is circular, with arched windows that provide incredible views of the Hogwarts grounds, and a domed ceiling painted with stars like the night sky. It has a white marble statue of founder Rowena Ravenclaw, and behind it lies the door leading to the dormitories.

The dormitories are in turrets off the main tower, where students can hear the wind whistling around the windows. The bedsheets on the four-poster beds are made of sky blue silk.

Question: what color is the sky? (It's going to be fun watching you guys figure it out...)