We use this locket to place in the octagonal bathroom window for privacy at night. I'm planning to put it on a louvered hinge, but for now we're just putting it on the windowsill. It is a shape that complements the octagon and is very insulating (due to low density polystyrene). I also painted the back white to make it look better from the outside, but when I add the hinge it attaches to a thin board to polish the outside (tub 1/2 near our front door). This Ekena company has carved a brilliant niche for itself.