 Plensa explores dualism with Crown Fountain , where he has two randomly selected faces " conversing " with each other . Plensa feels that by using faces , he can represent the diversity of the city both in ethnicity and in age . The artist intends to portray the <unk> evolution of the city by updating the collection of images . His representation has become a part of the city 's pop culture ; the first few episodes of the first season of Prison Break featured shots of the fountain . 
