This archive has been arranged so as to be able to exploit to the maximum the creation of hyperlinks among the various resources. Some of these resources are of very different types. For example, there are photographs, drawings, computer graphics, interactive animations, and videos.
To show you how to navigate without getting lost, we have organized some guided tours to help you explore "in safety" the structure of the archive. In fact, the resources in the archive are interlinked in various ways.