This disturbing and hilarious film achieves a delicate balance of the macabre and the absurd. At times it approaches satire, but its ultimate dramatic intensity belies a more serious study of faith and alienation. The performances of Aidan Gillen, as Francis, the lonely introvert voyeur, and Susan Tyrrell, his abusive mother, are exceptional. The production design and cinematography together create a strange and haunting world. One particularly interesting element is the use of sound to convey the protagonist's changing psychological perspective. Overall, this film has the unusual characteristic of staying with you long after you've seen it. I would highly recommend it.