It is an accessible form of propaganda and communication.
Explanation:
Many different religions use art to spread their belief. Places of worship are decorated both internally and externally with images and iconography of religious elements, to connect people with the divine, and encourage/remind them of the faithful path. It is also a sort of propaganda, an easy way of communicating the complex ideas that are faith and belief. Some of the religions that chose this approach are Christianity, Buddhism, and Hinduism.
Form is actual, three-dimensional shape, though it is often used to describe the illusion of three-dimensionality, as well. Like shape, form can be geometric or organic.
