What is a spy? This is the question the exhibition at the Cité des Sciences et de l’Industrie sets out to answer. Developed in collaboration with the DGSE and the team behind the series *Le Bureau des Légendes* (The Bureau), the exhibition invites visitors to discover the modern, high-tech methods used in espionage. For this project, Active Creative Design handled the design and production of three multimedia installations: “Sound Analysis,” an application where visitors uncover clues hidden within telephone conversations; “Satellite Images,” an invitation to explore a territory in search of a factory actually used for nuclear activities; and “Cryptography,” demonstrating how to encode secret messages within images or text.