The major capital in the example below is an historiated initial. The border around the text block is an inhabited border. These help to tell the story or convey the meaning of the text. Some marginal decorations are very strange indeed. The Macclesfield Psalter is a prime example. As with any other type of major decorated initial, the main elements are guided by the underlying geometry. The figure of the King below has his heart inside a vesica, which is symbolic of Christ. In medieval stained glass windows, the figures and other features frequently follow the lines of a geometry based on nested squares. Have a good look next time you're in a medieval cathedral.
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