Lima-based architect Karina Puente has a personal project: to illustrate each and every "invisible" city from Italo Calvino's 1972 novel. The book, which imagines imaginary conversations between the (real-life) Venetian explorer Marco Polo and the aged Mongol ruler Kublai Khan has been instrumental in framing approaches to urban discourse and the form of the city. According to Puente, who has shared six drawings with ArchDaily, "each illustration has a conceptual process, some of which take more time than others." Usually "I research, think, and ideate over each city for three weeks before making sketches." The final drawings and cut-outs take around a week to produce.