It’s cool to talk about cellular automata, everyone’s doing it. But how many people do it in reverse?

Here’s a simple PHP script to take any row of Rule 30 and wind it back to the initial state:

https://raw.githubusercontent.com/AlexanderParker/MyMillionNumberChallenge/master/attempts/23-automata/reverse-30.php

If you want to play in your browser, here’s a JavaScript version: