Two-arm
A two-arm universal constructor is one along the lines of the original Gemini spaceship, where two independently programmed construction arms sent gliders in pairs on 90-degree paths to collide with each other at the construction site. Construction recipes for two-arm constructors are much more efficient in general, but they require many more circuits and multiple independent data streams, which both tend to increase the complexity of self-constructing circuitry.
Also see
gollark: > I mean I live by the life idea that none of my data is private no matter how hard I try hence why I don't care about my Google home chilling out in my room... not really?
gollark: Google's business is data and ad revenue, and YouTube is probably profitable via those.
gollark: Yes, youtube "moderation" bad.
gollark: 🿿
gollark: I mean, secure boot exists, but otherwise I haven't heard of it.
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