Bridges and buildings, DNA, the periodic table, flora and fauna, machines, circuits, human beings and the societies of which they are part, even thoughts and ideas - all can be understood as particular structures which are part of our world and our experience of it. Yet the notion of structure, whether organic or inorganic, natural or artificial, is far more intangible. Too often the implication is of something rigid and complete, yet structure and the process of structuring can be both open and dynamic. These eight essays consider structure as an inclusive, open-ended theme offering itself to interpretation within many disciplines of the sciences, arts and humanities. Each essay represents an attempt to ponder and assess the role of structure in a particular discipline by an author eminent in that field. In doing so, the essays become acts of 'structuring structure', true to the rich, dynamic nature of the topic.