Bernini made the West Wind blow and show

"West Ponente," Vittoria said, reading the inscription on the stone. Langdon gazed down at the marble relief and felt suddenly naive. Not in his art books, not in his numerous trips to Rome, not ever had West Ponente's significance jumped out at him. Not until now."
From Angels & Demons by Dan Brown.

But what was the significance of the breath of air coming from the angel's mouth that Giovanni Lorenzo Bernini drew 400 years ago? Well, one view is that this is the breath of God — Respiro di Dio — blowing away from the Vatican and across Rome.

In the film of the book, this scene takes place at the base of the Egyptian obelisk that stands in the middle of St. Peter's Square. There, Robert Langdon (Tom Hanks) and Vittoria Vetra (Ayelet Zurer) find the dying Cardinal Lamasse, his lungs full of holes, and the word "Air" branded on his chest in the form of an ambigram.

Despite the criticism of its style and accuracy, Dan Brown's book has had the positive side effect of introducing millions of readers to the genius of Bernini, who used the power of art to create beauty and to achieve one of the most difficult things in the world: the visualization of air.