Library of Importance is a mnemonic device for survival, the first act of resistance against erasure. Cities rarely end. Hong Kong is a city that had ended once and is now close to its second extinction. This project digs deep into the hidden layer of the city and explores through archaeology methods to retrieve buried ideas with faint traces. Hong Kong’s cultural identity is embedded into the library by inscribing and coding its languages, symbols and culture. Through recognition, naming and decoding, values embedded in the city by architects are resurrected as ideas that are immutable.