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A portal in fiction is a magical or technological doorway that connects two distant locations. Portals are a common concept in sci-fi and fantasy fiction. They can be of two forms: either you must step through the frames of an object (a mirror, a cupboard, a picture frame, a gateway etc.) which serves as a portal or, when they stand alone, the portal will appear in the form of a vortex of energy. Places that a portal will link to: a different spot in the same world (in which case it might be an alternative for teleportation); a parallel world (inter-dimensional portal); the past or the future (time portal); and other planes of existence, like heaven, hell or afterworlds. Portal is similar to the (rather controversial) cosmological concept of a wormhole. Portals play a primary role in:
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