Viagem ao Invisível: Espaço, Experiência, Representação (Journey to the Invisible: Space, Experience, Representation), only available in Portuguese, is a book organised by Luís Santiago Baptista and Maria Rita Pais after a journey they curated to several works of architecture and an exhibition held at Teatro Thalia. The book documents exhaustively all the visited works with several unpublished archive materials (drawings, documents, and photographs), but it also includes artistic projects by artists Nuno Cera, Tatiana Macedo, Ricardo Castro, and Spela Hudnik, and critical essays by Inês Moreira, Eliana Sousa Santos, Susana Oliveira and myself. Under the title “Steps Toward A Small Theory of the Invisible”, the essay that I wrote departs from an essay by John Berger “Steps Toward a Small Theory of the Visible” and it examines the relation between visible and invisible in art and architecture. The launch will happen on Tuesday, April 23rd at Trienal de Lisboa in Lisbon, around 7 p.m., where several of the mentioned authors (including me) will talk about the book. Feel free to pass by… and to have a copy of this fantastic book for free (limited to the existent stock).