Two astronauts visit a distant rock strewn planet and stumble upon a rock that is an exact three-dimensional effigy of the philosopher Aristotle. There is nothing else remotely like it and no evidence of prior habitation or visitation.
Is the astronaut who supposes it must have been created naturally, by chance, more realistic than the one who supposes the opposite? And if it could be created naturally, who would believe the mountaineer on earth, who happened to stumble across an equivalent example?
So how far does chance go towards the explanation of things natural, or vice versa? More particularly, how far does nature go in the explanation of things artificial, or vice versa?