Glass Panels

Glass Panels would be similar to glass panes, the same width, length and height however they would be placed on the outside of blocks like trapdoors. whether you place them next to a block or not they would always be a square and fill up one side of a block, (like a trap door), these could be used for building, e.g. adding windows in a structure made out of trapdoors and would overall be very helpful when building.