there's another product called star fire, and that they're opti white is another name, that is nor clear. this is more clear. you can see on the edge, even though we're picking it up, this glass is a little more clear. there's another product called water white which is as clear as plastic, and just really, really clear. and so that's your next grade up in terms of being truly clorlless coralles coralless co. >> tiffany has a product which has as little barrier as possible. >> tiffany does not want you looking at green diamonds. the new laminated glass gives us different directions on what we can do. certainly we see that used in glass walkways. we're doing -- and of course the code on what can be used for a sky light that you can walk on, a walking surface, is very antiquated, as it's written -- >> it certainly is. it was originally written for the subsidewalk basement areas and other areas where the glazing is broken up into little squares. do you still replace those little glazing squares for the sidewalk? >> we have circles, walking down market street, which again tells you how old a