Imagine suddenly having a twin: rather like the hackneyed plot of many a potboiler movie, where the hero discovers that he has a twin of whose existence he was unaware (typically separated from the family during a mela, when they were very young). Practically your clone, the twin will be you in all aspects, except the physical: s/he will exist only in digital/virtual form. This doppelganger is, therefore, not a lookalike, but will act and react just as you do, based not only on your past, but updated in real time with your ongoing experiences and life.