  The Xapagy architecture is a story-oriented cognitive system which relies
exclusively on the autobiographical memory implemented as a raw collection of
events. Reasoning is performed by shadowing current events with events from the
autobiography. The shadows are then extrapolated into headless shadows (HLSs).
In a story following mood, HLSs can be used to track the level of surprise of
the agent, to infer hidden actions or relations between the participants, and
to summarize ongoing events. In recall mood, the HLSs can be used to create new
stories ranging from exact recall to free-form confabulation.
