Artifacts of the Presence Era: Using Information Visualization to Create an Evocative Souvenir. - Fernanda B. Viégas; Ethan Perry; Ethan Howe; Judith S. Donath (INFOVIS, 2004)

Artifacts of the presence era: visualizing presence for posterity. - Fernanda B. Viégas; Ethan Perry; Judith S. Donath; Ethan Howe (SIGGRAPH Sketches, 2004)