Get a command block: /give @p command_block
Place the command block.
Right-click on the command block.
Paste the command (CTRL+V) into the command block.
Exit the GUI.
Power the command block.
Watch the magic happen.

Installing the machine


The machine


The block eggs


Baby spires


Larger spires

Block eggs (e.g. stone, grass) will spawn a new spire in your world. This will grow for 5 minutes, then stop. You can add multiple spires at the same time.

Remove eggs (e.g. RemoveStone, RemoveGrass) will cause all spires of that type to stop growing.

/summon FallingSand ~ ~1 ~ {Block:redstone_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:fill ~ ~ ~1 ~ ~-37 ~1 redstone_block},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:fill ~ ~2 ~ ~ ~-38 ~1 air},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~3 ~10 ~ {Block:command_block,Time:1,TileEntityData:{Command:fill ~ ~ ~-1 ~6 ~ ~1 quartz_block}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 120 {display:{Name:"RemoveTNT"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 120 {display:{Name:"RemoveGlowstone"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 120 {display:{Name:"RemoveLeaves"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 120 {display:{Name:"RemoveCobblestone"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 120 {display:{Name:"RemoveDirt"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 120 {display:{Name:"RemoveStone"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 120 {display:{Name:"RemoveGrass"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 94 {display:{Name:"TNT",Lore:["DANGER!"]}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 94 {display:{Name:"Glowstone"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 94 {display:{Name:"Leaves"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 94 {display:{Name:"Cobblestone"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 94 {display:{Name:"Dirt"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 94 {display:{Name:"Stone"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /give @a spawn_egg 1 94 {display:{Name:"Grass"}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command: /tellraw @a [{text="Spires by Nmoleo",color="gold"}]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~4 ~-15 ~-1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Villager,name=RemoveCobblestone]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Villager,name=RemoveGlowstone] ~ ~ ~ /kill @e[name=Glowstone,type=Item]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Squid,name=Grass] ~ ~ ~ /summon Item ~ ~ ~ {CustomName:Grass,Item:{id:grass}}},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~5 ~-14 ~-1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Villager,name=RemoveGlowstone]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Squid,name=Grass]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Squid,name=Dirt] ~ ~ ~ /summon Item ~ ~ ~ {CustomName:Dirt,Item:{id:dirt}}},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~6 ~-13 ~-1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Item,name=Grass] ~ ~ ~ /setblock ~ ~ ~ grass},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Squid,name=Dirt]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Squid,name=Leaves] ~ ~ ~ /summon Item ~ ~ ~ {CustomName:Leaves,Item:{id:leaves}}},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~7 ~-12 ~-1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Item,name=Dirt] ~ ~ ~ /setblock ~ ~ ~ dirt},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Squid,name=Leaves]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Squid,name=TNT] ~ ~ ~ /summon Item ~ ~ ~ {CustomName:TNT,Item:{id:tnt}}},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~8 ~-11 ~-1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Item,name=Leaves] ~ ~ ~ /setblock ~ ~ ~ leaves},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Squid,name=TNT]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Villager,name=RemoveStone] ~ ~ ~ /kill @e[name=Stone,type=Item]},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~9 ~-10 ~-1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Item,name=TNT] ~ ~ ~ /setblock ~ ~ ~ tnt},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Villager,name=RemoveStone]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Villager,name=RemoveCobblestone] ~ ~ ~ /kill @e[name=Cobblestone,type=Item]},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~4 ~-10 ~1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Villager,name=RemoveLeaves]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Villager,name=RemoveTNT] ~ ~ ~ /kill @e[name=TNT,type=Item]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Squid,name=Stone] ~ ~ ~ /summon Item ~ ~ ~ {CustomName:Stone,Item:{id:stone}}},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~5 ~-9 ~1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Villager,name=RemoveTNT]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Squid,name=Stone]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Squid,name=Cobblestone] ~ ~ ~ /summon Item ~ ~ ~ {CustomName:Cobblestone,Item:{id:cobblestone}}},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~6 ~-8 ~1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Item,name=Stone] ~ ~ ~ /setblock ~ ~ ~ stone},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Squid,name=Cobblestone]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Squid,name=Glowstone] ~ ~ ~ /summon Item ~ ~ ~ {CustomName:Glowstone,Item:{id:glowstone}}},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~7 ~-7 ~1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Item,name=Cobblestone] ~ ~ ~ /setblock ~ ~ ~ cobblestone},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Squid,name=Glowstone]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Villager,name=RemoveGrass] ~ ~ ~ /kill @e[name=Grass,type=Item]},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~8 ~-6 ~1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Item,name=Glowstone] ~ ~ ~ /setblock ~ ~ ~ glowstone},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Villager,name=RemoveGrass]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Villager,name=RemoveDirt] ~ ~ ~ /kill @e[name=Dirt,type=Item]},Time:1,}}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:summon FallingSand ~9 ~-5 ~1 {Block:quartz_block,Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/kill @e[type=Villager,name=RemoveDirt]},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:/execute @e[type=Villager,name=RemoveLeaves] ~ ~ ~ /kill @e[name=Leaves,type=Item]},Time:1,}}}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:gamerule commandBlockOutput false},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:fill ~3 ~-5 ~ ~9 ~-3 ~ redstone_block},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:setblock ~3 ~-4 ~-1 command_block 0 replace {Command:fill ~ ~ ~1 ~6 ~2 ~1 stone 0 replace redstone_block}},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:setblock ~3 ~-3 ~1 command_block 0 replace {Command:fill ~ ~ ~-1 ~6 ~2 ~-1 redstone_block 0 replace stone}},Time:1,Riding:{id:FallingSand,Block:command_block,Time:1,TileEntityData:{Command:setblock ~1 ~-2 ~ wall_sign 4 replace {Text1:"{text:'Remove',clickEvent:{action:run_command,value:\\"/fill ~ ~-1 ~-2 ~9 ~4 ~2 air 0 replace\\"},color:black}",Text2:"{text:'',color:black}",Text3:"{text:'',color:black}",Text4:"{text:'',color:black}"}},Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:fill ~2 ~-1 ~-2 ~10 ~1 ~2 stained_glass 0 replace quartz_block},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:fill ~3 ~ ~-1 ~9 ~5 ~1 air 0 replace quartz_block},Time:1,Riding:{id:FallingSand,Block:command_block,TileEntityData:{Command:fill ~2 ~ ~-2 ~10 ~4 ~2 quartz_block},Time:1,Riding:{id:FallingSand,Block:stone,Time:1}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}

Get the items again:

/give @a spawn_egg 1 94 {display:{Name:"Grass"}}
/give @a spawn_egg 1 94 {display:{Name:"Stone"}}
/give @a spawn_egg 1 94 {display:{Name:"Dirt"}}
/give @a spawn_egg 1 94 {display:{Name:"Cobblestone"}}
/give @a spawn_egg 1 94 {display:{Name:"Leaves"}}
/give @a spawn_egg 1 94 {display:{Name:"Glowstone"}}
/give @a spawn_egg 1 94 {display:{Name:"TNT",Lore:["DANGER!"]}}

/give @a spawn_egg 1 120 {display:{Name:"RemoveGrass"}}
/give @a spawn_egg 1 120 {display:{Name:"RemoveStone"}}
/give @a spawn_egg 1 120 {display:{Name:"RemoveDirt"}}
/give @a spawn_egg 1 120 {display:{Name:"RemoveCobblestone"}}
/give @a spawn_egg 1 120 {display:{Name:"RemoveLeaves"}}
/give @a spawn_egg 1 120 {display:{Name:"RemoveGlowstone"}}
/give @a spawn_egg 1 120 {display:{Name:"RemoveTNT"}}