OP of the title refers to Opera Progetto, a series of books devoted to different contemporary buildings. The zero issue looks at Santiago Calatrava's Quadricci Pavilion in Milwaukee; issue one focuses on a Mario Botta museum; and the third – OP/2 – takes an in depth look at Frank Gehry's Walt Disney Concert Hall in Downtown Los Angeles. The next issue, per the back page, is devoted to a Kengo Kuma building, though I don't know how many more were published or if they continue to this day. If not, that's a shame, since this issue is packed with information on the concert hall: interviews with Gehry and the client; essays on the buildings, the city, and technology: and loads of photos, models, sketches, and hard-line drawings (the last are beautifully presented on gatefolds in black on silver, like the cover). Most helpful in understanding the building is "The Work" chapter, which breaks down each volume of the building and walks through them with photos, wall sections, and construction photos revealing what's happening behind the flowing metal skin. ( )