A collage by Laia Abril from her project On Mass Hysteria, which is on view this month at Le Bal, in Paris. Her monograph of the same title was published last year by Dewi Lewis. This artwork was inspired by an outbreak of a mysterious illness in 2006 that afflicted hundreds of girls at a boarding school in Chalco, Mexico. The illness, which was described by Mexican public-health authorities as a mass psychogenic disorder, was believed to have been an unconscious protest against conditions at the school. Courtesy the artist and Dewi Lewis