Boyhood: Film Released After 12 Year Wait
Boyhood, which follows the lives of one fictional family over 12 years, has been described as one of the most ground-breaking, unique films of the year.
Director Richard Linklater filmed the cast, which includes Patricia Arquette and Ethan Hawke as the parents, for a few days each year.
The story follows them as they are faced with love, marriage, divorce, school, work, pain and pleasure.
Critics have said it is Boyhood's simplicity which is its strength - plus its focus on the son Mason, played by Ellar Coltrane.
Mason and his big sister Sam (Lorelei Linklater, the director's daughter) are living with their divorced mother Olivia.
Dad Mason Sr is charming and loving but unreliable, and he has been off finding himself in Alaska.
Olivia moves the family to Houston so she can go back to school and get her degree.
She ends up marrying her psychology professor (Marco Perella), and it is a catastrophe - he turns out to be a dangerous, angry drunk.
Arquette said it wasn't hard to decide whether to take on the project.
"Rick called me and said what are you going to be doing for the next 12 years and I had no clue what the hell he was talking about," she said.
The film has some harrowing scenes but is also full of fun cultural references. Mobile phones become smartphones. Mason's GameBoy becomes an Xbox.
Political talk ranges from George Bush and the invasion of Iraq to the Obama-McCain presidential race in 2008 and later developments.
Fans of Linklater's 'Before' trilogy - Before Sunrise, Before Sunset and the recent Before Midnight - know how well he can portray the passage of time.
Hawke told Sky News: "It's been a little secret art project for the last decade, plus change, and something that I really love and now we're giving it away."
Boyhood is brilliant and unique but the logistical and financial implications involved makes it unlikely such an authentic movie will be made again.
Boyhood is out in cinemas now.