Marking the recent anniversary of the topping of St Paul’s Cathedral in London, public artist Martin Firrell exhibited text illuminations onto this iconic building. His controversial projections, in English, Arabic and Hindi, explore the relationship between art, faith and everyday life, tackling the crucial question of what makes life worth living.

Described as ‘the artful dodger meets Einstein meets an explosion in a sequin factory’ Martin Firrell is one of the UK’s secret gems. As a public artist he has raised questions about the politics of aging, individual liberty, cultural diversity, faith, climate change, masculinity, hero worship, and fair and truthful government. He has used cinema screens, newsprint, the internet and large-scale digital projection onto the National Gallery in London, the Houses of Parliament, the Royal Opera House, Covent Garden, Tate Britain, and St Paul's Cathedral.

Marking the first time that Firrell has allowed cameras into his creative process, this documentary follows the controversial St Paul’s project from beginning to end, and includes interviews with major faith leaders, famous atheists, philosophers and writers. Firrell is a compelling personality and his negotiations with the Cathedral's bureaucrats make for singular and idiosyncratic viewing – the world of contemporary art rubbing against the men of cloth in one of Britain's oldest institutions. The Question Mark Inside is more than a straightforward arts documentary. Firrell's work is public in the broadest sense and his projections embrace many cultures and creeds, and just as importantly appeal to those of no denominational allegiance or faith at all.

This is an entertaining and engaging piece that provides a unique insight into one of the most intriguing art commissions of the 21st century. St Paul’s Cathedral is a famous London landmark, visited by 2 million people each year. In 2010 the Cathedral will celebrate the 300th anniversary of its overall completion.