From Hilary White at The Sacred Images Project:
One of the most useful distinctions made by people who analyse art is between an image that simply presents something, and an image that tells a story. A portrait of a king, a still life of a bowl of fruit, a simple landscape, or an icon of Christ Pantocrator asks us to contemplate a single subject. They are essentially static images, like a single object in a dark room under a spotlight. Nothing is happening, and nothing is about to happen. It’s just Him and you.
But iconography is about making a visual statement about some eternal reality, even when the image itself is a story being told. We are all familiar with the single-figure icons of course, but there are narrative icons as well. The Nativity icon is a good example of this, where a single image will have several elements of a story presented as if they’re all happening at the same visual “time”1. The format here is to have the most important thing - the Nativity itself - in the centre, with all the side adventures going on around it.
This is called “continuous narrative,” in which the same characters appear multiple times within a single image to depict successive moments in a story. Time is compressed into one pictorial space. But instead of reading left-to-right like a comic strip, the viewer follows the action throughout the composition.
This technique goes back to classical Roman art (for example, Trajan’s Column) and was taken east by Byzantine artists, where it became especially common in manuscript illumination, fresco cycles, and some icons. (Read more.)





