What You Don’t Know Won’t Hurt You
Like the one in fairy tale It has been said that ignorance is bliss; therefore, keeping the fact that this is a window in the restroom a secret is probably in the best interest of everyone involved. Oops, it really seems that you are already intimately acquainted with this information.
It appears to be a conventional medicine cabinet at first glance. To make one, all you need to do is screw the hinges to the frame of the mirror and the window casing. Once you have done that, you will be able to see what is going on in your room even when you are in the bathroom. It does not sound bad at all.