  Nuclear effective field theories (EFTs) have been developed over the last
quarter-century with considerable impact on the description of light and even
medium-mass nuclei. At the core of any EFT is a systematic expansion of
observables, which is usually obtained from a rule based on an assumption of
naturalness. I discuss naturalness in the context of the relatively weak
binding of nuclei, where discrete scale invariance plays a role in the
emergence of complexity.
