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I've seen videos that explain how to make redstone double doors, but none of them really explain why redstone double doors work that way, just that they do.

Is there an explanation for their behaviour?

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  • This question is obsolete as of patch 1.2
    – user9983
    Aug 11, 2012 at 22:11

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Doors have two states, "open" and "closed". When you place two doors next to each other, the game automatically moves the 2nd door 90* and swaps the state (if it didn't, you'd just have two identical doors next to each other).

In manual use, the state isn't important, but as soon as you connect the door to redstone, it becomes very important: doors without charge go to the "closed" state, and doors with charge go to the "open" state. Because the doors are not next to each other in their "closed" state, you get the weird behavior you've observed.

Pictures incoming.

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    What does this mean about firing arrows through the window?
    – MBraedley
    Feb 2, 2011 at 22:32
  • @mbreadley -- What?
    – Raven Dreamer
    Feb 2, 2011 at 23:31
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    @Raven Dreamer, arrows can be fired in one direction through doors, so it's important to place the doors from outside your house. Otherwise the archer skeletons could fire in at you :) I don't know the implications of double-doors or redstone, however.
    – Cyclops
    Feb 3, 2011 at 1:38
  • Calling the two states "open" and "closed" is rather arbitrary: you could just as well call them "counterclockwise" and "clockwise".
    – Kevin Reid
    Feb 3, 2011 at 20:29
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    @Kevin -- I imagine most doors will be set in walls, which makes the distinction strictly less than arbitrary.
    – Raven Dreamer
    Feb 3, 2011 at 22:25

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