At another level, though, poems can craft an eraser - we can't revise the past, but poems allow us some malleability, an increased freedom of response, comprehension, feeling. Choice, what choices are possible for any given person, is another theme that's run through my work from the start.

A studio, like a poem, is an intimacy and a freedom you can look out from, into each part of your life and a little beyond.

Evolution tells us how to survive; art tells us how it's possible still to live even while knowing that we and all we love will someday vanish. It says there's beauty even in grief, freedom even inside the strictures of form and of life. What's liberating isn't what's simplest; it's the ability to include more and more shadows, colors and possibilities inside any moment's meeting of self and world.

You may do this, I tell you, it is permitted. Begin again the story of your life.

It's one of the saving graces in a life, to be able to perceive one's own and others' absurdity, to notice our shared human frailties and be able, at least some of the time, to smile rather than grimace. Like most people, I must have started out with a comic worldview in my cupboard.

Good poems ask us to have complex minds and hearts. Even simple-of-surface poems want that. Perhaps those are the ones that want it most of all, since that's where they do their work: in the unspoken complexities, understood off the page.

Poems are always interested in what Ivan Illich called 'shadow work,' not least because that is no small part of their own way of working.