12 Principles of Animation

Squash and Stretch

Squash and stretch describes how an object deforms under force while maintaining its overall volume. Squashing occurs when an object compresses from impact or pressure, while stretching occurs during fast movement or acceleration. This deformation communicates material properties such as softness, rigidity, or elasticity.

Used correctly, squash and stretch gives motion a sense of weight and physical credibility. Without it, movement appears stiff and mechanical. The principle applies not only to cartoon objects but also to facial animation, body motion, and subtle deformations in realistic characters.

Anticipation

Anticipation is the preparatory movement that precedes a main action. It signals intent by setting up the direction, force, and scale of the upcoming motion, such as a crouch before a jump or a backward arm swing before a throw.

This principle ensures actions are readable and believable rather than abrupt or confusing. Anticipation guides the viewer’s attention and allows time to process what is about to happen, making the action feel intentional instead of sudden.

Staging

Staging is the clear presentation of an idea, action, or emotion through composition, posing, camera placement, and timing. The goal is to make the viewer immediately understand what is important in a shot without visual ambiguity.

Effective staging eliminates competing actions and visual noise. By controlling contrast, silhouette, and spatial relationships, staging ensures that the narrative or emotional beat is communicated clearly and efficiently.

Straight Ahead Action and Pose to Pose

Straight ahead animation is created sequentially, drawing each frame in order to produce spontaneous and organic motion. This approach often results in lively, unpredictable movement, making it well-suited for effects like fire, smoke, or fluid motion.

Pose to pose animation begins with carefully planned key poses that define structure and storytelling. The in-between frames are added later, allowing greater control over timing, clarity, and consistency. Most character animation combines both methods.

Follow Through and Overlapping Action

Follow through describes how parts of an object continue moving after the main body has stopped. Overlapping action occurs when different parts move at varying speeds and do not start or stop simultaneously, such as limbs, hair, or clothing.

These behaviors reflect inertia and mass, reinforcing the illusion of physics. Without follow through and overlap, motion appears rigid and artificial, as if all elements are locked together rather than physically connected.

Slow In and Slow Out

Slow in and slow out refers to the natural acceleration and deceleration of movement. Objects rarely start or stop instantly; instead, they build speed gradually and settle smoothly, which is represented by more frames near the beginning and end of an action.

This principle prevents motion from feeling robotic or linear. By shaping the spacing of frames, slow in and slow out creates fluidity and emphasizes weight, intention, and emotional tone.

Arcs

Arcs describe the curved trajectories that most natural movements follow. Human limbs, animal motion, and even thrown objects tend to move along smooth, circular paths rather than straight lines.

Animating with arcs produces motion that feels organic and continuous. When arcs are ignored, movement often looks mechanical or unnatural, even if the timing is correct.

Secondary Action

Secondary actions are supporting movements that complement and reinforce the main action. Examples include facial expressions, gestures, or subtle body shifts that add context without distracting from the primary motion.

These actions enrich performance and clarify character intent. Effective secondary action remains subordinate, enhancing the main idea rather than competing with it for attention.

Timing

Timing refers to how long an action takes and how many frames are used to portray it. Adjusting timing alters the perceived weight, speed, and emotional quality of motion, making it a fundamental storytelling tool.

Precise timing distinguishes between light and heavy movement, hesitation and confidence, or comedy and drama. Even small changes in timing can drastically alter how an action is interpreted by the audience.

Exaggeration

Exaggeration involves pushing motion, pose, or expression beyond realistic limits to improve clarity and impact. This does not mean distorting reality arbitrarily, but selectively emphasizing essential elements of an action.

By exaggerating what matters most, animation communicates ideas more clearly and emotionally. Subtle exaggeration is often present even in realistic animation, strengthening readability without breaking believability.

Solid Drawing

Solid drawing refers to the understanding of form, weight, balance, anatomy, and perspective. Characters and objects must feel three-dimensional, even when rendered in a stylized or simplified design.

This principle ensures consistency and physical credibility across movement. Poor solidity results in characters that appear flat, weightless, or unstable, undermining the illusion of life.

Appeal

Appeal is the quality that makes a character or motion engaging to watch. It is achieved through clear shapes, strong silhouettes, balanced proportions, and purposeful design choices.

Appeal is not limited to attractiveness or cuteness; it applies equally to heroic, villainous, or grotesque characters. An appealing animation invites attention and sustains interest through clarity and personality.