Null‐length springs, in spite of being apparently simple, reveal several unexpected properties. All of these stem from the fact that these springs, lacking a characteristic length, show no differences between longitudinal and transverse vibrations. Some of these qualities are demonstrated in an elementary way so as to show the underlying physics. The properties proved are used to obtain certain well‐known results of introductory physics. Finally, an experimental setup is described briefly to simulate null‐length springs.