3D Projection Mapping or 3D Video Mapping merges typical visual storytelling with the forms and shapes of whatever is being projected onto. The shapes, characters, colours of the video content are blended with, or mapped onto the physical object.
Using the latest projection technology, the object appears to change shape and colour and become one with the animated content. Typically mapping is used on large and elaborate buildings, with the content working with the form of the building.
But really 3D mapping can be used on anything.