You're going to start facing a rectangular window. Turn around, walk down the stairs and take your first left. This is a studio area. No need to go further. Turn around, and this time, we are going to walk past the red and white rock in front of us. Take a right using the door that is right after the staircase. Once you are there, no need to go further. Just stop in front of the small... this is a mirror cabinet with some hats. You're done.