'As I start to write this paper, my notes lie stretched out in a long poem of language shifts and comparisons: essay-as-wager, essay-as-puzzle, essay-as-notation, essay-as-conversation, essay-as-meditation. It is in this act of comparison, the 'as' moment, that we begin, again and again, to think about the essay form. Its 'as-ness' suggests that the essay is not a singular discursive mode but a set of modes, at once many things and many opportunities. The essay practises thinking-while-writing, a compositional process that moves knowledge forward to the limits of its language, in language.' (Author's abstract)