AA Files 71 features essays on Brunelleschi, by Pier Vittorio Aureli, on the Museum Insel Hombroich, by William Firebrace, on Louis Bonnier, possibly the most boring architect in nineteenth-century France, by Andri Gerber, on the relationship between the artist Joseph Beuys, the architect Hans Hollein and the curator Johannes Cladders, by Eva Brans