Boullier D. (2019), « Designing Envelopes for Attention Policies » in Doyle W. and Roda C. (eds.) Communication in an Era of Attention Scarcity, Cham (CH), Palgrave-Macmillan, pp. 63-73. Attention regimes are plural and include : loyalty, alertness, projection and immersion. Attention policies become a critical stake for the public sphere. The design of media architectures should be understood as the design of envelopes so that the public can inhabit collective states of minds in a livable way.