Carrol was always fascinated by the legend that Michelangelo went to Carrara to choose the best blocks of marble for his sculptures, including the David and the Pieta. As it was not possible to do the Enigma range in marble she chose to use porcelain. After experimenting with glazed and unglazed finishes it was decided to use unglazed as it kept the integrity and crispness of the facial features.