Circle of Mirrors

The Circle of Mirrors was a time travel device created by the alternate UNIT of Donna's World, by harnessing the power of the Tenth Doctor's salvaged TARDIS. It allowed Donna Noble to see the invisible Time beetle on her back and allowed her to go back in time and turn left. (DW: Turn Left)
 * Theodore Maxtible had also utilised mirrors and static electricity to achieve time travel. (DW: The Evil of the Daleks. Using a circle of mirrors on Deva Loka, the Fifth Doctor was able to trap and defeat the Mara. (DW: Kinda)