This is the manual of NASA’s corporate identity. Beyond a simple fascination for NASA, the manual is an exhaustive presentation of a visual identity – from letterheads to the markings on the space shuttle Discovery. It allows the reader to apprehend the different formal, political and technical scales of the use of signs and the clear guidelines and restrictions. The clarity of its texts which guided the personnel responsible for producing new documents contrasts sharply with the mainstream vocabulary in the communications field today. It demonstrates the ambition and care taken in its presentation. Its format facilitates manipulation to ensure the organization, comprehension and implementation of the instructions and propositions it contains.