The model for Herzog and de Meuron’s recently announced stadium for the 2008 Beijing Olympic Games is a crossover from structure to poetry, writes Giles Worsley. “When built, it will rise 67 metres in the heart of the city and hold 100,000 spectators. The model captures the sense of ambiguity that increasingly surrounds the architects’ buildings, particularly where façade and structure meet. The Basel-based firm that designed Tate Modern has used the idea of a nest of twigs to give external form to the building, a lattice of massive concrete beams, through which spectators penetrate to the heart of the building – the stands.”