article addresses the status of homogeneous diphthongs in Spanish (those formed of two high
vocoids, usually spelled iu or ui) to try to determine which vocoid acts as the syllable nucleus
and which is the glide. It has generally been assumed that the order is glide-vowel (rising-like
but with little factual substantiation. A study of examples of rhyme from different
ages in Spanish poetry and theatre in verse confirms the strong tendency for these diphthongs to
act as rising-like.