Shifting patterns

This poem by California poet and scientist Lucille Lang Day weaves a shifting display of images -- the flight patterns of birds made vivid with mathematical terminology. As the poet's observations meander, they build to a question: is a galaxy something like a sparrow?

     Form/Formless      by Lucille Lang Day

     A flock of red-winged blackbirds 
     swooping and swirling 
     in cyclonic and anticyclonic patterns 

     always in motion like Jovian clouds 
     that appear, then disappear 
     according to the mathematics of chaos 
     in yellow, brown and salmon-colored layers