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A ponte, o arco e a pedra

"Marco Polo descreve uma ponte, pedra a pedra.
- Mas qual é a pedra que sustém a ponte? – pergunta Kublai Kan.
- A ponte não é sustida por esta ou por aquela pedra – responde Marco, - mas sim pela linha do arco que elas formam.

Kublai Kan permanece silencioso, reflectindo. Depois acrescenta:
- Porque me falas das pedras? É só o arco que me importa.
Polo responde: - Sem pedras não há arco."

In: As Cidades Invisíveis de Italo Calvino

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