Glass Shutters I have not seen these before but I suspect that this kind of interior shutter might prove useful in certain climates. Similar to the thermal window systems in North America, they have the advantage of being moveable and discreet at the same time. One of the difficulties when thermal windows are installed is that the heat in summer is often hard to disperse. Hence the need for air conditioning in modern, well insulated homes. Homes that are state of the art when it comes to heat retention, and energy saving, can become overly warm in the short summer months. For some climates, glass shutters might prove a useful alternative. Obviously the original windows and the view are unobstructed. Besides, they have charm and beauty. Depending on your view of course. Made by The Glass Shutter Company Ltd they might suit your needs. Another clever adaptation by an innovative company. Here is the link. http://glassshutter.co.uk/contactus.html https://www.youtube.com/w