This practical and informative book highlights the relationship between pictures and linguistic representations of information. The authors define a new classification for pictures that focuses on the tasks users carry out with the help of images on computer screens, and present a model for analyzing and influencing the flow of information. For specialists in computer science, the book bridges the gap between computer graphics and human-computer interaction, while for general readers, it offers a wealth of insights and practical advice on how to use pictures as a medium of communication.