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Yes, but the next iteration will take care of those interactions. You're not really "moving" anything; that was poor imagery on my part. The illustration on the Wikipedia article shows it well: https://en.wikipedia.org/wiki/Block_cellular_automaton

There are some diagonal interactions that are not directly expressible in this way, but they can propagate through the non-diagonal neighbours instead.

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Do you know if this is a technique they're using in Noita? I've implemented falling sand simulators but I'm baffled how you can make a game like that performant.

I've been meaning to try Noita and it happens to be 50% off on Steam at the moment: https://store.steampowered.com/app/881100/Noita/

Thanks for reminding me.

Here's a talk from the creator of Noita about the underlying tech. From 9:20 he talks about their multithreading implementation. https://www.youtube.com/watch?v=prXuyMCgbTc

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