Walls, fences, glass, slabs, hoppers, and stairs cannot be powered so redstone torches attached to them cannot be deactivated. Effectively, a redstone torch inverts the signal applied to its attachment block: power level 0 is changed to 15 and power levels 1 to 15 are changed to 0 (for an alternative that produces a greater range of output power levels, consider a redstone comparator in subtraction mode). Activation A redstone torch is active unless the block it is attached to is powered. For example, if a fence is on the ground, attempting to attach a redstone torch to the side of the fence causes the redstone torch to be attached to the top of the ground next to the fence instead. Attempting to attach a redstone torch to an invalid surface can cause it to "snap" to a valid surface adjacent to the same space. Redstone torches cannot be attached to the bottoms of any blocks.
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