We’ve all come to terms with a neural network doing jobs such as handwriting recognition. This panel of special glass requires no electrical power, and is able to recognize gray-scale handwritten numbers. The glass contains precisely controlled inclusions such as air holes or an impurity such as graphene or other material. The team thinks they could do better if they allowed looser constraints on the glass manufacturing.

https://hackaday.com/2019/07/16/neural-network-in-glass-requires-no-power-recognizes-numbers/