Sign

Signs are entities that have text on one side of them. They may only be obtained through crafting. Signs may be used to mark property, leave directions, state rules, or even leave out your poetic stylings for travelers to stumble upon. Signs can also be used to create furniture such as the sides of chairs or ends of beds.

Signs are one of the many blocks that are broken more quickly with a sword, but still deal double damage to the sword.

Signs were originally added in Survival Mode, but removed shortly after. They were re-introduced in infdev, where they would have greater use. As of the 07/02/10 update (Seecret Friday update #3) signs became smaller.

Water cannot enter the space occupied by a sign, so signs, like ladders, may be used to make a doorway through which water cannot flow. There is also a glitch which allows you to place signs on top of other signs.

Placing a sign
After placing a sign, a window pops up asking you to type out the text that will be placed upon the sign. Four lines of text are available, with 15 characters on each line. The sign's text may only be changed by removing it (which will discard the text) and placing it again. In SSP, the game pauses until you finish typing the sign's text.

You can place signs in the ground sticking out or on walls without any post grounding them. Signs may be placed attached to any block, including ones such as fences, glass, other signs, and minecart tracks which torches cannot be attached to.

Free-standing signs can face one of 16 directions, and face toward the player when placed. Wall-mounted signs can only face the four cardinal directions, and are attached to the face you click on of an existing block.

Due to the South/West rule, Signs can be used to create a Water Ladder, which allow the player to ascend quicker. However, a door may be more efficient for entrances to the ladder from the ground, as doors only need the 6 wooden planks, and not the stick.

If you place a sign underwater, either on the side of a block or on top of another sign, an air bubble will form, allowing you to breathe underwater.

When you run out of room on the first line of the sign. press 'Enter' to go down to the next space. You may not put any text after you have filled up all four of the lines on the sign

Trivia

 * A sign occupies a full block of space, making it possible to make floating water or lava.
 * Another use for the above fact is placing paintings on them, this makes for a hidden entrance
 * Signs do not have a collision mask, so you and mobs can walk through them.
 * You can place a sign on top of a sign.
 * You can put a gravity effected block right above a sign mounted in the ground, it will not fall down.
 * When a sign is placed on a gravity affected block that was generated floating, the block will fall and the sign will be lost.
 * Signs will not display the breaking animation (Cracks).

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