One was the Univocalic and the other the Tetractys: I’m still trying to work out how to pronounce that second one.
They operate like this. The univocalic poem uses a single vowel throughout and avoids all others, while the tetractys is a poem with five accumulating lines. Line 1 is one syllable, line 2 has two syllables and so on to a maximum of five syllables. A Double Tetractys is two such poems back-t0-back.
I like to play with rhyme and form and once challenged myself to combine the two: a univocalic poem in the form of a double tetractys. Rather an odd couple.
It didn’t quite come off because I needed to add a couple of extra five-syllable lines to complete it, but the univocalic element, avoiding a,i,o and u, was spot-on.
The result was Wren, of which I’m rather proud.
her clever eye,
her sweet essence. Deep,
let her sleep be deep;
there, let the green hedge
be her perfect bed;
the rye, the reed,
be her screen;