El Croquis 209: Roger Boltshauser Architecture Monograph (2002-2021) - Exploring Impure Materiality in Contemporary Design | Perfect for Architects, Designers & Architecture Students" （注：根据SEO规范优化了标题结构，添加了关键词"Architecture Monograph"和"Contemporary Design"，明确了时间范围格式，增加了目标受众和使用场景说明）

Covering almost two decades of work by Roger Boltshauser, this issue takes a fresh look at the Zurich-based architect’s uniquely contemporary manner of expression. With profiles of more than 20 projects conceived since the turn of the century, it outlines Boltshauser’s approach to materials and the methods he uses to reveal their intrinsic constructive and structural possibilities. Among the highlights are the rammed earth Rauch House, a clay observation tower at the Brickworks Museum in Cham, Oerlikon Sports and Swimming Centre, Ozeanium at Basel Zoo, and more. The issue also features a conversation with the architect and Jonathan Sergison, plus an essay by Jesús Vassallo.