The rare artifact on the left, now on display at the British Museum, has been misidentified by the curator as a "decorated bronze mirror". The metal hoop at the top supposedly was used to hang the mirror on the wall of a dwelling.
The design on this mousepad is clearly of Fractal origin, as anyone with a familiarity with the images of the Mandelbrot set will attest. "Clearly, the use of fractal images on a mirror makes no sense at all, but the use of fractal images on a mousepad is quite common," attests Dr. Tunalu.
The handle at the top of the mousepad is the cause of confusion. What most archaeologists don't know is that Celtic mousepads were indeed hung on walls, and used vertically, with the user in a standing position. Mirrors, on the other hand, were used in a sitting position.
A related mislabeled find, the "Battersea Shield" (see below) is presumed to be decorated with the image of a Julia set, another type of fractal, named after the French Mathematician Gaston Julia.