Educational Matrioska collects the pedagogical experience of the subject: "Academic Project" of the Master's Degree in Architectural Communication (MACA) as specialized training of the Doctorate in Architectural Communication of the ETSAM-UPM. The main objective of the subject is "how to teach to teach", as part of the learning of architectural communication. It is a 45-credit subject, which develops intensively in two consecutive weeks. After the first three editions of this subject: Matrioska (16-17), Madrid Heroes and Vilains (17-18) and Mestizo Madrid (18-19), we analyze the successes and mistakes of an innovative pedagogical experiment, which tries to give tools for teaching through empowerment, selflearning and self-knowledge of students so that they can enhance their abilities to address new challenges in real-time practical teaching to other students (learn by doing), reversing roles and eliminating hierarchies.

Heroes and Vilains (in the Gran Vía of Madrid) is a course taught by the students of the third edition of the Master in Architectural Communication (MACA) in the subject "Teaching Project", a subject where students become teachers. This article details this teaching experience in which students had to organize and teach in an ATHENS (Advanced Technology Higher Education Network) course, a one-week international course within the internationalization program of the Polytechnic University of Madrid (UPM). This article details and analyzes the methodology, structure and tools used during this pedagogical experiment focused on critical positioning in front of the contemporary city and based on student self-exploration, and collaborative learning in the classroom through digital tools focused on the professional world.

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