ABSTRACT
Imagine that you are sitting in front of a computer. On the screen there is a picture. It is a view of a very large park. There are no words. You have been told, however, that if you use the mouse to point to some part of this picture and press the button you may then see a new picture. This new picture shows some more of the area. What is shown depends upon where you point; it may be a view slightly further to the right or the left, or it may bring you closer to something, such as a house that was in the distance. You soon find out that you can, in turn, explore the new picture by pointing with the mouse and pressing the button. This will lead to further pictures; each taking you further on in your tour of the area, or allowing you to inspect something more closely and in more detail. You may, for example, wish to try to find a way into the house and examine some of the furnishings inside. There are many possible routes that you can take and it is also possible to retrace your steps; you find out that you can point to a symbol on the screen which takes you back to the previous picture. There are now no further demands upon your computing skills; you are free to explore.
