Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dark, involving, challenging

I was never a great fan of Robin Williams as a comedian, but he has proved himself a great actor time and again, including in this superior psychological thriller. As "Sy the Photo-Guy", Williams is as chilling as he is sympathetic.For the most part, director Romanek eschews predictability and takes us on an ambiguous journey that challenges us and involves us on every level rather than presenting an easy, black-and-white universe that cues us to gasp or scream in the appropriate places. This is a tale told with a great stylistic flair that fleshes out rather than detracts from the thematic material. Certainly this will come to be regarded as something of a minor classic in years to come.