Borromean rings depicted in a church in Florence, Italy. If any one of the three rings is removed, the other two are no longer joined. Credit: Raphael Salzedo/Alamy The coat of arms of Italy’s ...

image: Schematic presentation of made-to-order assembly of Borromean rings on a 4x4 particle array. The feasible tangle combinations were tested by the numerical algorithm based on the Jones ...