Multiple gate soil pots are synchronized using a microcontroller to form a simple processor-like half-adder circuit

Anything which is bistable and can be driven into the states by the "flow" mechanism which adduces value and change, is capable of being part of a logic system. It never ceases to amaze me what people find that works. I wouldn't have seen this coming but now I'm mentally assessing all kinds of biological states for the potential. We use shellfish to command river remediation releases, they're probably tractable.

It's like the hunt for Turing completeness in text editors.