Uploaded December 2016 | Updated September 2026, 1 hour ago

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Today I present to you an extremely fast 4x4 vault door in minecraft 1.11 using observers. It is not seamless and could (probably) be made 1 tick faster (which I will probably do, it will just probably not be as compact). I will also probably come out with 2 sided and seamless versions.
(Recorded with http://screencast-o-matic.com)