A couple of interesting examples in this (loose) subject area: https://arstechnica.com/science/2018/07/neural-network-implemented-with-light-instead-of-electro

A couple of interesting examples in this (loose) subject area: https://arstechnica.com/science/2018/07/neural-network-implemented-with-light-instead-of-electrons/ https://arstechnica.com/science/2018/07/neural-network-imple... https://pruned.blogspot.com/2012/01/gardens-as-crypto-water-computers.html https://pruned.blogspot.com/2012/01/gardens-as-crypto-water-...