The phrase, "centre and circumference," the title of this poetry collection, comes from Percy Bysshe Shelley's 1821 essay, A Defence of Poetry.* Shelley's metaphor is how I have come to imagine poetry - in fact all the arts - as well. In his essay, Shelley (1821/1840) writes, ... Poetry is at once the centre and circumference of knowledge; it is that which comprehends all science, and that to which all science must be referred. It...