50 miniature lead crystal glass taxis were made using lost-wax kiln-casting and placed at random over the area allocated to Rachel, in the Crypt, which was where gravestones and memorial plaques were stored, most with very ornate decoration and inscriptions. 50 was chosen as it was the 50th anniversary of the production of the original Black Taxi Cab shape, that is now iconic and exported across the world.
The installation emulated a sort of ghostly infestation, as it was not always apparent what the piece was due to the scale and lighting. But as soon as one taxi was spotted by the viewer, the others were quickly found, much to the amusement of younger members of the public.