Kaleidoscope

A kaleidoscope was a toy which allowed the user to create and view symmetrical, colourful patterns.

On 26 July 2202, the Eighth Doctor spent all day looking at a kaleidoscope. (PROSE: Seeing I)

In Vienna, the Eighth Doctor used a kaleidoscope to expose a bartender as a Bacchanite. (PROSE: The Sorrows of Vienna)

Danny Dillard was gifted a kaleidoscope by his Nan, and enjoyed playing with it until his dad stamped on it in a drunken rage. (PROSE: Kaleidoscope)