You could build a cool building, it is also a crafting material for buttons, stone pressure plates, stone slabs, stone bricks, and redstone repeaters.
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It's called stone, and you get it by putting cobblestone on a furnace.
Simply combine 4 Stone(the smooth version, not cobblestone) in a square in either the crafting slot on your player or a crafting table to make stone bricks.
When you mine regular 'smooth' stone, you get cobblestone. This can be converted back to smooth stone by smelting it in a furnace.
2 smooth stone set out like this in a crafting bench. X = nothing O = Stone XXX XOX XOX
You make them out of wood or smooth stone (not cobble). The wood ones can detect items and mobs/players, the smooth stone only the mobs/players. You make them like this: xxx xxx mmx where x is nothing and m is wood or smoothstone