“’I’ve personally spent only one night in jail,’ Frank Gehry confessed. ‘I didn’t like it very much.’ Gehry, 88, who has been described as our greatest living architect (and, by an admiring pro-cannabis website, as a Very Important Pothead), said he got his only taste of incarceration when he was busted for possession many years ago. Last Friday in New Haven, that night behind bars was a kind of credential. An invited audience of architects and students, corrections officials and campaigners for criminal justice reform assembled at the Yale School of Architecture for the finale of Gehry’s semester-long “studio” on architecture and mass incarceration. A dozen students would present their projects — designs for a humane prison — to a jury consisting mostly of Friends of Frank.”