The mental space is a theoretical construct proposed by Gilles Fauconnier[1] corresponding to possible worlds in truth-conditional semantics. The main difference between a mental space and a possible world is that a mental space does not contain a faithful representation of reality, but an idealized cognitive model.[2] Building of mental spaces and establishment of mappings between those mental spaces are the two main processes involved in construction of meaning.[3] It is one of the basic components in Gilles Fauconnier and Mark Turner's blending theory, a theory within cognitive semantics.