'Islands of regularity' in the post title is a thoughtful allusion to the 'island of stability' long anticipated (and at the hairy edge, starting to be seen) in

'Islands of regularity' in the post title is a thoughtful allusion to the 'island of stability' long anticipated (and at the hairy edge, starting to be seen) in a cluster of superheavy element isotopes (like in tbe 110-120 atomic number range). https://en.wikipedia.org/wiki/Island_of_stability https://en.wikipedia.org/wiki/Island_of_stability