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154 Understanding the project e design process Understanding the space Understanding building structures Organising the space e human interface Sustainable design Communicating design Presentation drawings ree-dimensional drawings Chapter 3 looked at the use of technical drawings as aids to the understanding of space and the development of a design solution. In particular, plans, elevations and sections were introduced as the primary methods for depicting the horizontal and vertical planes of an interior. Other drawing types exist that can be used to see the space as if from diff erent, and in varying degrees more realistic, viewpoints. When deciding which drawings are needed to explain the scheme, careful note must be made of the important points of the scheme that need to be explained. Existing drawings used to aid the planning of the space may be used as presentation drawings, or it may be necessary to create completely new drawings. ere are two other basic types of drawing that show spaces and objects in three dimensions; the fi rst type use geometric drawing techniques to create a pseudo 3d eff ect, though because they ignore the foreshortening eff ects that we see in real life they can look somewhat distorted. ey are usually drawn to represent the space as viewed from outside its boundaries. Vertical lines on the drawing represent heights, while widths and depths are represented by lines at other fi xed angles. e family name for these drawings is axonometric, and the two most common are plan oblique (where widths and depths are represented by lines drawn at 45 ° to the horizontal), and isometric (in which width and depth are shown by lines drawn at 30 ° to the horizontal). Perhaps slightly confusingly, in interior design parlance, plan oblique drawings are o en referred to as axonometric, while isometric drawings retain the name isometric. In the plan oblique or axonometric drawing, the plan shape of any item remains unchanged as it is elevated to its correct height in the drawing. us a circular table, for example, will be drawn with a circular top, which is contrary to our experience of seeing such a table in real life, and so to some extent the drawing looks unnatural. However, it can be a useful drawing because it allows us to produce a basic three-dimensional interpretation of a space or an object relatively quickly. e drawing creates a feeling of viewing the subject from a high viewpoint, and so is helpful when drawing views of relatively small spaces, typically bathrooms or kitchens. e fact that the plan view remains unchanged makes the initial set up of this drawing relatively fast.