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A Shimmer was a cloaking device used by the Vinvocci to change their appearance.
Appearance and function
These devices were disguised as a wristwatch, and was apparently uncomfortable to use. The Doctor could easily detect a shimmer even when not looking at it, such as when he deactivated Rossiter's shimmer. (DW: The End of Time)
History
Rossiter and Addams picked up a signal from a medical piece of equipment and used shimmers to work for Joshua Naismith undetected. The Doctor deactivated them with his sonic screwdriver. (DW: The End of Time)
Behind the scenes
- The name of the device implies that the cloaking process involves light.