This text aims to explain the structure of things in the simplest possible terms. It demonstrates that everything you see and touch, live in and use, living and man-made, has a structure which is acted upon by natural forces and reacts to these forces according to its form and material. This notebook was originally written as a brief teaching aid for students who had very little, if any, knowledge of physics or structural behaviour. This new edition has been expanded while retaining a simple visual and non-mathematical approach to structures.