I would define the poetic effect as the capacity that a text displays for continuing to generate different readings, without ever being completely consumed.
Umberto EcoThe pleasures of love are pains that become desirable, where sweetness and torment blend, and so love is voluntary insanity, infernal paradise, and celestial hell - in short, harmony of opposite yearnings, sorrowful laughter, soft diamond.
Umberto EcoYou don't fall in love because you fall in love; you fall in love because of the need, desperate, to fall in love. when you feel that need, you have to watch your step: like having drunk a philter, the kind that makes you fall in love with the first thing you meet. It could be a duck-billed platypus.
Umberto Eco