Daniel Buren’s spectacular colour and light intervention at the Liège-Guillemins train station in Belgium takes a precise approach to the notion of “as-is,” minimally altering yet radically transforming what already exists. Unveiled in October 2022, the work is completely integrated into the Santiago Calatrava-designed station, which serves as a major stop for domestic and international rail travel. In the main part of the roof-based installation, squares of white, blue, orange, pink, and green are arranged in a chessboard-like grid.