John F. Santore
An artificial agent interacting with the world will often encounter
objects that its perceptual system cannot distinguish, either due to
the limitations of its sensors or, given modern manufacturing
technology, because of the extreme similarity of the objects. However,
a reasoning agent should be able to distinguish between many of these
objects, based on spatial and temporal information. (For example, if
an object 
was blown up at one time, and object 
, looking
exactly like , is seen at a later time, then should be
assumed to be different from .)