In a recent publication, Daniel Walters, Xian Powers and others in the Balch/Olmstead group have prepared a novel, photoluminescent molecular cage that is entirely constructed from non-luminescent components. In its crystalline form, the resulting molecular "box" suspends an anionic guest, a chloride ion, inside. Crystals of the box change when subject to mechanical force, which causes their rearrangement into an isomeric helicate dimer that uses the original guest as a br