Technical blocks

Technical blocks are blocks that cannot be acquired without mods and serve various purposes during events within the game.

Piston related technical blocks
These blocks serve a purpose when a piston is used.

Piston Extension
Block 34 is a block used by the piston's extension arm. One of the data bits of this block defines if it is a normal piston or a sticky piston extension. Many players use this block as a table instead of the standard pressure plate on fence. Block 34 cannot be placed even if the player has Block 34. Block 34 can be obtained by placing the cursor on Block 34 and clicking the third mouse button in creative. It can, however, be placed with some programs.

It is possible to create a piston arm that will not disappear when the block next to it updates, but it will disappear if the piston that created it is moved or destroyed (The piston is both extended and retracted at the same time.) This can only be done with sticky pistons. To replicate this, one must create a "smart piston" (a piston that will push a block away as soon as the block is placed in front of the piston). This is accomplished by putting a redstone torch underneath the space where the block will be, and connecting wire from next to the space where the block will be to the piston. Since the pulse that will be created is less than 1 tick (1/10 of a second), the sticky piston will not stick to the block. Next, place blocks in front of the piston until it can't push any more, and destroy the block immediately in front of the piston (again, this must be a sticky piston.) The piston will extend and retract several times, then stay extended and retracted at the same time until either the piston or the arm is destroyed (strangely, destroying the arm will not destroy the piston, but moving or destroying the piston will destroy the arm.) (Tested horizontally in Minecraft 1.2.5.)

Piston Moving
Piston Moving is a block used by pistons. It is a side effect of the method of storing moving blocks as tile entities instead of entities. It is used by the piston extension for the effect of the animation coming out of the piston base. This block's color, when located next to a block in the world, is black. When a block next to it is removed, it becomes invisible, can be walked through, and when light passes through it the light level decreases by 1. They are unbreakable by traditional methods, though they can be removed by simply right-clicking. The game treats the block as a stone block when it comes to their breaking animation and the sound of the player's footsteps. In the inventory it has a top of a gray grass block texture and it cannot be placed. Block 36 has no name other than its block code, 36. It is impossible to obtain block 36 without mods or the /give command on multiplayer servers. This block, if hacked into the game, can be used as a method to block fluids. Block 36 is transparent, and entities can pass through it.

Burning Furnace
This is a block used to make furnaces shed light when smelting. It has a different texture than the normal furnace and emits particles. It will replace the normal furnace block while the furnace is burning fuel, but once the fuel runs out it will revert. Through /give or other means you can place this block and it will "burn" for as long as you don't use it.

Glowing Redstone Ore
This is a block used to make Redstone Ore glow when stepped on, right-clicked, or left-clicked. Glowing Redstone maintains its glow if pushed or pulled by a piston, but eventually stops glowing as if it had been touched by the player when placed.

Block 75
Block 75 is a block representing an off-state Redstone Torch. When a normal Redstone Torch receives power it turns off, turning to this block, and stops giving power. When the torch stops getting power it turns back to the normal on-state torch, and gives power again. For the game to know the torch stopped getting power the game must update the block - this happens when a block near the torch changes, and when it turned off because of Redstone current, this is not a problem, but when spawned into the world it will be turned off, and because no block is updated, it will stay this way, until a block updates. When the block is removed it will turn to a normal on-state torch. This can be used to create 'burnt out' torches. This is also available in the new creative inventory (12w21b) under the Redstone section. The Normal torch is under Decoration.

Block 94
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Block 124
Block 124 is the "on" state of the Redstone Lamp When placed, it immediately turns off.

Flowing Water
The flowing water block tells the game to check for any air blocks around it and put some water into them if applicable. When placed using a water bucket or a mod it will flow 8 blocks in all gamemodes.

Flowing Lava
The flowing lava block tells the game to check for any air blocks around it and put some lava into them if applicable. Lava flows for 4 blocks in overworld and 8 in the Nether (flowing the same distance as water, but still at the speed of lava).

Trivia

 * Even when a source block is destroyed, lava keeps flowing for quite some time.

Bugs

 * Flowing lava still burns but depending on the direction of the flow, the graphic is changed.


 * In Creative mode, lava always starts flowing. But, in a 1 x optional pit, it will never do so.


 * In Creative mode, if lava is flowing, then you box it into a 1x1 box, it will continue flowing.

Farmland
Farmland is a block on which seeds (melon, pumpkin, wheat) can be planted and grown, and it is made by using a Hoe on Dirt or Grass. If farmland is within four blocks of water it gradually becomes hydrated. Rain will also randomly hydrate farmland blocks. If left dry and unplanted, a farmland block will eventually turn back to dirt, and then regrow its grass. A farmland block's damage value specifies its hydration level - the more hydrated it is, the darker its appearance, and as it dries out it becomes lighter again.

Wheat Stalks
This block appears when seeds are planted on farmland.

Pumpkin Stem
The block that is planted on farmland when pumpkin seeds are used on it. It starts off-set under-ground, and rises up as the plant grows, as opposed to the method wheat seeds uses, where each growth stage is an individual texture. The stem is coloured green by the game, and then brown once fully grown.

The stem will change to the second image once a pumpkin has grown off the stem. A single stem will connect to any Pumpkin in an adjacent square, thus there are 5 possible appearances to a stem. When the pumpkin is removed, the stem will return to its original image.

A single pumpkin will grow off a full grown stem at a time, but once that pumpkin is removed, another can grow in its place.

Destroying a fully-grown stem yields 0-3 pumpkin seeds.

Melon Stem
The block that is planted on farmland when melon seeds are used on it. The colouring and growth method is the same as the Pumpkin Stem's.

The stem will change to the second image once a melon has grown off the stem. A single stem will connect to any Melon in an adjacent square, thus there are 4 possible appearances to a stem with a melon on it and 1 without. When the melon is removed, the stem will return to its original image.

A single melon will grow off a full grown stem at a time, but once that melon is removed, another can grow in its place.

Destroying a fully-grown stem yields 0-4 melon seeds.

Monster Egg
Monster Egg (also known as Silverfish Block or Block 97) is a block that may look like a Stone block, a Cobblestone block, or a Stone Brick block, but is actually a block that spawns Silverfish when destroyed.

Nether Portal
Nether Portal blocks are generated when a portal is formed, standing in them will teleport the player from The Overworld to the Nether and vice versa. However, they disappear when a block is placed next to it. In creative mode you can break this block and it will play the glass breaking sound. The Portal Block can be obtained in creative mode by clicking the scroll-wheel button on the players mouse and will copy the portal block in the players slot. It can also be obtained with the use of mods or the /give command on a server. The portal block's animated texture is procedurally generated, like water or lava. Nether Portal icon in Inventory are different in Overworld and Nether.

Trivia

 * Although you cannot legitimately activate a Nether Portal in The End, Nether Portal blocks will function properly and take you to a place in the Nether that corresponds to the location in the Overworld from where you first entered The End.
 * If you are running weekly snapshot 12w16a or up you can obtain a portal block using cheats.
 * The inside of the Nether Portal block is hollow.
 * Despite popular belief, if you manage to obtain a portal block, you only need one, without a frame, to warp to the Nether. This applies to both Nether and The End portals.
 * Though this block must be obtained with an inventory editor, it is not possible to place two nether portal blocks next to each other in the vanilla game.
 * If obtained with an inventory editor, or using the 'Pick Block' button to get the block, the block can be broken with a sound similar to glass while in creative mode.
 * While in your inventory, it appears as a full block unless it is rendered in the world. (Example, it looks like a normal full block, but when you place the hacked portal in your inventory, it will then render as it looks in Minecraft)
 * If pushed by a piston, this block disappears and causes the piston to glitch out, showing both an extended arm and a retracted arm.
 * When looking through a Nether Portal, rain and waterblocks become invisible

End Portal
The End Portal is a block that will teleport the player into or out of The End dimension. It looks like a hole to a three-dimensional void with layers of blue and greenish stars, and emits light and black smoke particles. Only the top and the sides of the block are technically visible, and the bottom side is transparent‏. In addition, the bottom and top cannot be passed through, although the sides can be. The collision box for this block takes up the lower 1/16th of the block, similar to Snow.

Wherever the End Portal block exists, there is also a tile entity named “Airportal”. This tile entity has no additional data and is presumably responsible for the special visual effect only. When a player touches an End Portal block, they are teleported to the End if they are in the Overworld, or to the Overworld if they are in the End.

Trivia

 * The End Portal is technically the only block without a conventional texture, or entity texture; it uses the same image as the background of The End, with an additional effect added on top.
 * When the End Portal is destroyed, it releases gray particles, because it has no texture as such - it is rendered differently to normal blocks in-game, using multiple textures, and so for the inventory icon and the particle texture, it just uses the texture at (0, 0) in terrain.png, the default, which is grass.


 * Unlike a Nether Portal, the player is instantly teleported to The End. As such, the player has no time to fall into the lava below the portal.
 * Despite popular belief, if you manage to obtain a portal block, you only need one, without a frame, to warp to the Nether. This applies to both Nether and The End portals.
 * As of Beta 1.9 Pre-release 4, End Portal blocks can be destroyed in Creative Mode. This does not affect the effects of adjacent End Portal blocks.
 * If the Portal is viewed from underneath it will be invisible, allowing you to see through the portal.
 * If a player moves from an End Portal Frame (which does not have an Eye of Ender in it) onto a Soul Sand block placed on the sides of an End Portal Frame, they will briefly sink an extra distance while crossing over.
 * If TNT is detonated on an end portal no blocks in its blast radius will be destroyed the same as if TNT is detonated in water.
 * Passing the End Portal while riding a minecart will not teleport you to the end, instead you will simply pass through the portal straight into the lava below, because the portal does not check for riding entities, but only the hitting entity itself.
 * When a player properly passes through an End Portal, they maintain their vertical speed. Jumping from a very tall height into an End Portal usually results in massive fall damage (and usually death) when they land on the Obsidian panel that is created at the spawn point.
 * In multiplayer, hacked end portal frames making an end portal will disconnect the player because they "moved too fast", and when they respawn, they will spawn in an empty end above the void with no obsidian plate, falling in the void.
 * The Player can obtain some of the technical blocks in creative mode by clicking the scroll-wheel on their mouse and the portal will appear in their slot.
 * As of the 12w23b snapshot, the endportal frame block can be found in in the creative menu.
 * However, by using the "pick block" you may select an End Portal Frame block in an open inventory space.
 * Mobs that would typically teleport or catch on fire (Zombies, Skeletons, and Endermen) will ignite/teleport if standing in an End portal block.
 * This block can be destroyed by the Ender Dragon when said mob passes through it.
 * Though this block cannot be pushed or pulled by pistons, when placed next to a piston which is then turned on, if you delete the portal block the piston glitches out, showing both an extended piston arm and a retracted arm.



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