Bottle universe

A bottle universe was an invention by I.M. Foreman, where the entire contents of a universe are scaled down and placed within a bottle. The creator had some degree of control over the universe, but many aspects took place of their own accord. (EDA: Interference - Book One)

History
I.M. Foreman created the bottle universe and played with the mechanics of it while on Foreman's World. It was stolen from her by the Time Lords while she and the Doctor slept. (EDA: Interference - Book One, Interference - Book Two)

Chris Cwej worked for the Time Lords in securing the universe in a bottle and opened a gateway for the Time Lords to invade and destroy the bottle universe version of 1970s Earth. (BNA: Dead Romance)

The Time Lords planned to use the bottle universe as a safe retreat from the Enemy. Greyjan the Sane proposed the theory that the Enemy were actually primordial cells that were energized by the leaking bottle. (EDA: The Ancestor Cell)

Marnal created a bottle universe when trying to discover the fate of Gallifrey after it had been destroyed. He later used it to track the Doctor through time and to also learn about what kind of person he was, and the type of person he was to become. (EDA: The Gallifrey Chronicles)