This shows you how to get command blocks, invisible blocks, and player heads in minecraft.
command blocks: When activated by redstone, commands blocks do a certain task such as teleport players to a pacific place, fill an area with a certain type of block, summon any type of entity including the enderdragon and giants (Giants are a secret mob in minecraft, and they aren't in a mod!). invisible blocks: Invisible blocks are invisible as you can tell by the name. You can not break invisible blocks except for when you are in creative mode. When holding invisible blocks in your hand they become visible. Player heads: player heads can be used to show what you look like for custom maps. You can say on a sign "Created by (whatever your username is)" Then put your player head on top so that people can see what your minecraft skin looks like. You can also put them on armor stands and where them like a helmet.
