What was the preferred two dimensional medium for didactic in the Byzantine Empire?

In the Byzantine Empire, the preferred two-dimensional medium for didactic purposes was iconography, particularly through religious icons and frescoes. These artworks served to educate the faithful about biblical stories, saints, and theological concepts, making complex ideas accessible to a largely illiterate population. Icons were often used in churches and homes, functioning as visual aids for worship and devotion. The rich symbolism and detailed craftsmanship in these artworks played a crucial role in the spiritual and cultural life of Byzantium.