When Ayatollah Ruhollah Khomeini took power in Iran 35 years ago on February 11, Iran's filmmakers had good reason to worry.The strict code of censorship ushered in by the Islamic Revolution convinced many that creativity and film were no longer compatible in Iran.Yet today, despite the continuing strict censorship rules governing them, Iran's artistic films -- as opposed to the country's commercial-release films -- are universally acclaimed as among the most innovative and important participants in international film festivals.The filmmakers' ability to overcome the suffocation of censorship, while still working under it, is one of the rare successes in the daily struggle ordinary Iranians wage to have greater personal freedom under an authoritarian regime. At the same time, the battle against censorship has had a great influence in forging the look and style of Iranian art films, which have earned a place of distinction in the eyes of film lovers worldwide.Many authoritarian governments impose strict political restrictions on artists. But the Islamic republic's censorship code is unusually strict because it includes social restrictions as well. The social restrictions particularly limit how relationships between men and women -- one of the most fundamental subjects of the arts -- can be depicted.The red lines forbid almost all physical gestures of romantic love, limit the kinds of issues that can be discussed, and bar women from singing or dancing on screen. They also require actresses to wear the hijab -- clothing that masks the figure and covers the hair -- for indoor as well as outdoor scenes, even though in reality Iranian women generally dress at home as they wish and don't cover their hair.Jamsheed Akrami, a professor of film at William Paterson University in New Jersey, says that the censorship code is so burdensome that the first talent any serious filmmaker must possess is the ability to get around it."Whenever you are under strict restrictions, you try to find out ways of getting around them to still communicate your messages. To the credit of the Iranian filmmakers, they have become very adept at skirting the censorship codes," Akrami says. "In fact, as an Iranian filmmaker your most prized possession is your ability to undermine the censorship codes and find ways of getting around them. Your artistic gift is like a secondary requirement."One way to get around censorship is to allude to subjects rather than address them directly. Akrami -- whose own recent documentary "" explores how Iranian directors such as Jafar Panahi (maker of "," an independent film banned from public screening in Iran ), Bahman Ghobadi (maker of "," an underground film never screened in Iran ), and the Oscar-winning Asghar Farhadi operate under censorship -- says the art of allusion has become the hallmark of Iran's art cinema."Iranian movies in film festivals are praised for their minimalist approach, for their aesthetics of omission, how they say things by not saying them, how they show things by not showing them. But we can never be sure that those approaches are decisions that are made consciously by the filmmakers or whether they are the results of the censorship," Akrami explains. "You don't know if a filmmaker who is using a minimalist approach is doing it [because he chooses to] or because he can't be more open in his communication with the audience."One technique many filmmakers have successfully used is to discuss the difficult subject of adult romantic love by viewing it through the innocent eyes of children. Another is to use traditional village life as a setting for discussing urban social themes. Both children and village life are generally viewed by censors as posing no threat to the Islamic republic's strict moral codes or to its political stability.What art films from the Islamic republic might look like without the burden of censorship is impossible to know. But Akrami, who has interviewed dozens of Iranian filmmakers, says they unanimously believe they could make better films if the censorship were lifted.Making films in Iran is an activity that not only tests artists' ingenuity. It also can bring heavy punishment if the artist is deemed too independent.The best-known filmmaker to suffer punishment recently is Panahi, who was arrested in 2010 after years of conflict with the authorities over the content of his films. Panahi received a six-year jail sentence, which was suspended after an outcry from the international community, and is banned from making films for 20 years.The easiest course is to simply cooperate fully with the state cinema authorities, who provide directors with loans to fund films and offer some free equipment if the initial script is approved. Fully cooperating also means guaranteed approval for the film to be shown in domestic cinemas or on television.The directors who cooperate make commercially successful films that simply accept the incongruities imposed by the state censors. That includes the absurdity of showing women wearing the hijab as they sleep at home and the careful avoidance of volatile social topics such as attraction outside marriage or high unemployment among young people.But directors who want to make artistic films -- the kind that go to international festivals -- have only two ways to do so. They can still try to make serious films within the state system, but at the risk of seeing their films banned if they are caught breaking censorship rules.Or they can try to make underground films at their own cost and without state approval. The films made outside the state system may get to global film festivals but they cannot be shown in Iran's cinemas and can only be distributed illegally through black-market copies or via Internet download.Both Iranian underground films and those made within the state system have won critical acclaim at film festivals.Mohammad Abdi, a London-based film critic and author, says underground films have dominated Iran's success at festivals during most of the last decade. "If you look at the films in the Cannes, Berlin, Venice, and many other festivals during the last 10 years, especially during the [Mahmud] Ahmadinejad presidency, you see that most of them were made without permission and actually they are illegal in Iran and they have no opportunity to be shown in the [domestic] cinema," he says.However, the Iranian film to have the greatest recent success internationally is not an underground film but one made by working within the censorship system. It is Farhadi's film "A Separation," which won an Academy Award for Best Foreign Language Film in 2012, the first Iranian film to ever do so.Abdi says Farhadi has proved to be unusually adept at working within and around the censorship restrictions to produce films that both gain permission for domestic showing in Iran and gain international acclaim for their depth of content and innovative storytelling.