Minecraft wiki entry for Adding_beauty_to_constructions, associated text: If you are in the beginning of your survival, it's a matter of preference as to whether or not you want to go focus on aesthetics or material conservation. If you choose the latter, then it's recommended not to use glass blocks, as you can use glass panes to conserve materials. If you either chose the former or are more advanced in your world, you should use glass blocks if it looks better.