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Why are these pistons (indirectly) powered? But the others completely not? None of them update with a block (Not really a BUD piston I believe, or is it?)

enter image description here

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  • defenetly a bud!
    – BRHSM
    Mar 26, 2017 at 15:27
  • It's not a BUD (Block Update Detector), it doesn't update at all.
    – Azoraqua
    Mar 26, 2017 at 21:20

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This appears to be a known concept of Quasi-Connectivity and may be used as a Block Update Detector (BUD). Although your specific design does not seem to be BUD.

Relevant quote from the wiki (emphasis mine)

In addition to the normal methods of activation described above, pistons can also be activated if one of the methods above would activate a mechanism component in the block above the piston, even if there is no mechanism component there (even if the block above the component is air or a transparent block).

And some relevant images from the same page

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enter image description here

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  • aka its the torches fault
    – Venya
    Apr 15, 2017 at 1:19

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