Billenium (or Billennium) is a short story by British author J. G. Ballard, first published in the November 1961 issue of New Worlds and in the 1962 collection Billennium. It later appeared in The Terminal Beach (1964), Chronopolis and Other Stories (1971), and The Complete Short Stories of J. G. Ballard: Volume 1 (2006). With a dystopian ambience, "Billennium" explores themes similar to Ballard's earlier story "The Concentration City", of space shortages and over-crowding. Source: Wikipedia (en)