Nara Roberta Silva on onerous US visa regulations, the liberal mythology of a “nation of immigrants,” and racialization as state-making.

A.V. Marraccini on Christopher Wren, Restoration London, city planning, fires, Riemann curvatures, the persistence of history, Japanese Metabolist architecture, Agnes Martin, grids, and other things that are or are not a torus.

A letter from the editors.