[xorand]

A scenario more interesting than boundless self-replication is Ackermann goo [0], [1]. Grey goo starts with a molecular machine able to replicate itself. You get exponentially more copies, hence goo. Imagine that we could build molecules like programs which execute themselves via chemical interactions with the environment. Then, for example, a Y combinator machine would appear as a linearly growing string [2]. No danger here. Take Ackermann(4,4) now. This is vastly more complex than a goo made of lots of small dumb copies.

[0] https://chemlambda.github.io/collection.html#58

[1] https://chemlambda.github.io/collection.html#59

[2] https://chemlambda.github.io/collection.html#259

[carapace]

Thanks for the nightmares! :-)

[xorand]

:) Probably is a sort of revenge on people more interested in semantics than geometry.