The ability to name poetry's gestures and rhetorics isn't required to write or read them, any more than a painter needs to know the physics of color to bring forward a landscape. The eye and hand and ear know what they need to know. Some of us want to know more, because knowing pleases.

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.

Go back to The October Palace, which came out in 1994, and there are poems with windows, doors, the rooms of the gorgeous and vanishing palace that is this ordinary world and ordinary life. Jungian archetype would say the house is a figure for the experienced, experiencing self.

Poetry's task is to increase the available stock of reality, R P Blackmur said.

Poetry's work is not simply the recording of inner or outer perception; it makes by words and music new possibilities of perceiving

Any artist, in any field, wants to press deeper, to discover further. Image and sound play are among the strongest colors available to poetry's palette. For a long time, I've wanted to invite in more strangeness, more freedom of imagination. Yet music, seeing, and meaning are also cohering disciplines. They can be stretched, and that is part of poetry's helium pleasure. But not to the point of breaking.

A poem's essential discovery can happen at a single sitting. The cascade of discoveries in an essay, or even finding a question worth exploring in one, seems to need roughly the time it takes to plant and harvest a crop of bush beans.