Here are a couple photos I took last winter of some of insulators in sunny windows on a bright winter day while "looking up". I have been using jalousie glass for shelving (typically in 30-inch lengths) for many years without any problems. I just make sure that the heavier pieces are on the ends and lighter insulators in the middle. There's hardly any flex to the glass...which I got a bunch of for free on Craigslist a few years ago. Great stuff for window shelving for less bulky insulators if you do it right.