parentsshellstructural geometry(Block et al., 2017)(Block et al., 2017)(BEHNEJAD et al., 2021)(BEHNEJAD et al., 2021)(Schober & Schaffert, 2016)(Schober & Schaffert, 2016)Adriaenssens et al., 2021Adriaenssens et al., 2021Frozen PavillionsFrozen Pavillions