Wallsharing
![A five by five by five cube of silver riveted blocks, with four large fan housings on the nearest side. The right side has two controllers barely visible.](http://static.miraheze.org/gtnhwiki/thumb/0/0d/QuadSteamTurbine.png/300px-QuadSteamTurbine.png)
Wallsharing is a behavior of most GT multiblocks that allows them to have one or more walls in common with another multiblock of the same or even a different type. This can be used to parallelize production lines, economize on space or save construction resources. To wallshare, two or more machine controllers need to be placed in such a way that all the shared blocks are in legal locations for all conjoined multiblocks. Some multis cannot wallshare due to their inherent design which lacks the necessary symmetry. Wallsharing is not a unique feature that needs to be explicitly enabled; it will always work where physically possible as a controller only cares about the blocks within its defined limits, not what's adjacent or built nearby. As long as the structure of each multi individually is correct, it will continue working as if nothing else around it existed.
Multiblock machines from other mods cannot wallshare. Many will not even form with another multi of their type adjacent, such as Coke Ovens and Water Tanks.
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3x Oil Cracking Units
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4x Alloy Blast Smelters
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4x Industrial Material Presses
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Large Chemical Reactor chain
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Large Chemical Reactor, Distillation Tower and Industrial Electrolyzer
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Double Industrial Sifter
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Pair of 8x Volcanus
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Pair of side-mounted quad Electric Blast Furances with AE2 subnet & LCR
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16x Nano Forges