New Glass Mechanics/Blocks

Might include:
Glass slabs
Display case lids (Crafted like a trapdoor)
Glass breaking when you fall on it too hard, if an anvil falls on it, or if it's shot with an arrow.

Optifine glass border mechanics in Vanilla.

All of these could unlock plenty new building combinations, as well as a possible redstone benefit. They could help the game look even better, as well as adding some realism to it. (I apologize for this being such a short feedback, it's 4 in the morning and I'm exhausted.