Book excerpt: Finnish architect Pekka Harni runs a design and architecture practice in Helsinki together with industrial designer Yuka Takahashi. Their collaboration results in a variety of work, of which this book on the classification of objects is just one part. Based on a morphological-functional consideration of the properties of household objects, the study proposes to organise the forms of artefacts, determine the significance of their parts and explain the relationships between objects and the environment, thus describing their most important basic properties while exploring the realm of functional form.