Glossary
Tangent Vortex
The point at which a Tangent Universe touches the Primary Universe. In the film it is directly above the Darko house.
"Those living nearest to the Vortex will find themselves at the epicenter of a dangerous new world." The Vortex explains why the Manipulated are all Donnie's family, friends and neighbours, and why the Artifact lands in his bedroom rather than anywhere else.
Defined in The Philosophy of Time Travel