The amazing human ability to get information from faces have been influential to certain visualizations -like Chernoff faces - which explore that perceptual condition to represent data or information. In general, the visualizations using faces work with drawings, in "Facing data" the main component is to explore faces to represent information but using photography. Additionally, to read the images in an appropriate fashion the OPENGL three-dimensional space offers us tools to see using zoom-in and zoom-out. The old techniques of chiaroscuro were also a useful tool to determine the final look and feel of the project.
Finally a component of physical interaction -using wiring- is presented as a way to interact with the application.
Important elements found
Represent data with faces have clear limitations when working with many elements, but for certain projects where data involves information about people, it can be a good way of "including" the people on the representation.
The element of humor also appears I don't have a clear explanation, but must of the people smile or even laugh when they see the visualization using photorealistic faces.