This review provides an overview of vibration-induced emission (VIE), a new approach that allows molecules to emit multiple colors by undergoing conformational changes. The focus is on sterically hindered dihydrophenazine (DHP) derivatives, especially the N,N'-diphenyl-dihydrodibenzo[a,c]phenazine (DPAC) core, illustrating how large-amplitude "butterfly" vibrational motions in the excited state govern their light emission behavior. Key molecular design strategies for