Houses need windows and the glass backdrop provides just that. It has a transparent back tile bound by wood and when placed next to other glass backdrop, forms a single large pane with a thin wooden border. It is one block square and has no collision. Like all backdrop blocks, glass backdrop layers behind items and solid blocks.
How to Obtain
This backdrop can be crafted, and is also found in many world-generated structures in all biome types, where it can be mined. You can also trade for this backdrop in a market world.
Glass backdrop is great for those large picture windows, and is often used in conjunction with fancy glass backdrop to create interesting patterns. Glass backdrop is used in crafting jars, as well as in some lighting items.