Anyone at all familiar with the architectural work of Herman Hertzberger (b. 1932) knows that underlying his designs is an extensive set of ideas and references. For thirty years Hertzberger has carried around a sketchbook to record his impressions. The accumulated books record fascinating analyses of buildings, landscape sketches, diagrams and partial solutions to current commissions. Two architectural historians have worked closely with Hertzberger to select from these sketches and notes pages which best reveal the architect's design process. The result is a stimulating look into the inner workings of one of architecture's great minds.