This movie starts with a man (Geoffrey Rush) trying to go through heavy rain. This man tries to enter to a restaurant/pub that just closed. A kind waitress let him in and he tries to play a piano that is in the middle of the lounge. The man obviously has some kind of mental disease as he cannot speak correctly and appears to be as stubborn as a little kid. Who is this guy? He is David Helfgott, the protagonist of the movie.
The movie is about this man/kid who is a gifted pianist. He is invited by the most prestigious schools of his time to study with them. But his dad, who is kind of strict, doesn't want David to go since he thinks that will shatter his family. Not just that, but he also wants to teach him musical scores that are far beyond his ability.
The way the time is manipulated in the movie is really good. It consists in two different storylines: the one of the grown up David and the one with the child David. As the story advances, the young David storyline reaches the old one, or it seems so. But later on the young David storyline reaches the beginning of the adult storyline and from there just the older David's story is depicted until the end. It may result a bit difficult to understand if you haven't seen the movie, but it is unlikely that you will end in a knot due to the way the time is manipulated since the technique used is really good.
Also, the acting of Rush as David is superb. The way he stutters and fires all David's words is outstanding and it really helps to make the audience believes that David is mentally-ill. Also, is kind of hilarious when David does things that are not well-socially accepted like touching the breasts of women in public or jumping half-nude in a garden.
In conclusion, The Shine is a movie everybody should watch. It depicts David's in a realistic form. And what is more, it is really entertaining.