Instruct: Classify Amazon reviews into positive or negative sentiment
Query: One of the Greatest Artistic Achievements of the 21st Century

Joaquin Phoenix delivers a performance that is both strikingly believable and insightful. His character represents the arrogance of hollywood, and the abrupt descent to insanity that has nearly become a platitude in circles of fame. Phoenix made a bold move by acting under his own name, and it proved tremendously powerful. The philosophical gravity of the experiment is profound, and its implications on social identity. I believe this film has been sorely mistaken as a 'lost, self indulging' feature. I think it is the exact opposite, a truly artistic act made for the purpose of artistic advancement.