112 Progress toward Cyberimmortality Wactlar created a system called Experience on Demand, for the  Defense  Advanced  Research  Projects  Agency,  unobtru- sively capturing people’s experiences in a form that facilitates sharing  them.  [13]  At  Microsoft,  Gordon  Bell’s  team  has been developing ways to collect and organize the documents and experiences of a lifetime in a project called MyLifeBits. [14;15] Many  researchers  are  developing  computer  methods  to record how people perceive their environments. [16] Others are developing the technology not only to record real environ- ments but to make virtual copies of them, notably the effort at Columbia University to duplicate electronically the Cathedral of Amiens, the Virtual Vaudeville project at the University of  Georgia  to  recreate  century-old  performances  like  those of acrobat Sandow the Magnificent, and the Monuments and Dust project at the University of Virginia to recreate Victorian London, beginning with the famous Crystal Palace. Recordings of behavior include facial expressions, [17] per- sonal conversations [18] and the subtle delays when a person responds  to  challenging  stimuli.  [19;20]  Lisa  and  Daniel Barrett [21] have used pocket computers to conduct a random sample of the things a person does or experiences, and we can well imagine that within a few years many people will have their wearable computers constantly switched on and sending their words, deeds, and feelings over wireless Internet to be recorded on a home digital library. ARTIFICIAL INTELLIGENCE Once data about an individual personality have been ported into an information system, some method is needed to revive it. One common idea is that some form of artificial intelli- gence (AI) will reanimate the person’s mind, so it is worth