Quatrain? What kind of train is that? Actually, it's a poem! Quatrains are poems with patterns of rhyming words. Award-winning author Brian P. Cleary explains how quatrains work-and shows some of the many ways they can be written. I Saw an Invisible Lion Today is packed with poems on subjects ranging from grandmothers to muzaloos to make you giggle and howl. And when you've finished reading, you can try your hand at writing your own poems!