"TAWDDGYRCH CADWYNOG" POETIC FORM As she touch dome Crystal blue there Flap by feather fly Among them Has wild wings & gleam Flap and wander Her soul shimmer Like phoenix flame The tawddgyrch cadwynog is a Welsh poetic form with at least two quatrains and recurring end rhymes. Here are the guidelines: Composed of pairs of quatrains (or four-line stanzas). Each pair of quatrains rhyme abbc/abbc. Four syllables per line.