Final answer:
The 12th principle of animation is Time and Motion, which helps artists create a sense of movement and passage of time in their static images.
Step-by-step explanation:
The 12th principle of animation is Time and Motion. This principle helps artists to create a sense of movement and passage of time in their static images. It can be achieved through the use of spatial relationships, such as perspective and atmospheric perspective, as well as scale and proportion. For example, objects that recede into the background become smaller in scale and lighter in value. Additionally, repeating the same figure or form in different places within the same image can give the illusion of movement and the passage of time.