New York’s MoMA announced its intention to demolish the American Folk Art Museum, a 2001 work of Tod Williams Billie Tsien. The decision has caused bewilderment because the champions of the campaign in defense of the building, Diller Scofidio + Renfro, authors of the MoMA’s new expansion project, have themselves ultimately been the justifiers of the razing – sparing at least the facade, as this goes to press. Adapting the AFAM to the enlargement, they say, would involve such major structural changes as to render continuity of the building unjustifiable, and any attempt to accommodate it would be an obstacle to the MoMA’s desire for flexibility and transparency.