a 'good' poem crumbles in your mouth. it doesn't tell you, chiding, "this is how i should taste" - instead decomposes into the loam of ages. no single flavour is the same to every person.
a 'good' poem forces open the jaw, climbing in. it begs no hospitality - it needs none. and as it clambers on your tongue (trying to avoid incisors), only taste keeps you chewing, rolling gobs of words over molars, wondering when before you've felt them without knowing.
sustaining life sustains a string of otherwise insubstantial little letters no better than ideograms, clicks and chirps all ones and zeros, really. we embroider and tack up that which our minds give meaning to.