Borromean rings are a structure in which no two rings are interlocked, yet the three are inseparable. I’ve been puzzling over the meaning of this lately. They’ve been used to represent the Holy Trinity (natch), but could they also represent some other natural or philosophical truth? Red herrings abound: the Borromean PB&J sandwich, for example, is negated by the undeniable goodness of toast with jelly. I’m flummoxed. Can you think of any other Borromean Thing?