The story of OOPEAA began in a rural field in Finland, where the now-iconic Kärsämäki Shingle Church was built by hand by hundreds of volunteers over half a decade. In the years that followed, OOPEAA has established itself as one of Finland's leading architecture firms, one that is distinguished by a sensitivity to material and craftmanship - first under the name Lassila Hirvilammi Architects and, from 2014, as OOPEAA Office for Peripheral Architecture. In text, photographs and drawings, this book traces the office's development into one of the most innovative and exploritory architectural practices in the Nordic region today.