Which characteristic describes cel animation?

Cel animation is characterized by the process of creating animations using hand-drawn or painted frames. Traditionally, this technique involves creating individual images on transparent sheets (cels) that are then layered to produce the desired motion. Each frame is meticulously crafted by artists, making cel animation a labor-intensive art form that emphasizes the skill and creativity of the animator.

This method allows for fluid movement and expression, as each frame can be tailored to the character's actions. While modern animation has introduced digital methods and computer-generated imagery, the roots of cel animation are firmly grounded in the manual artistry of drawing and painting by hand, showcasing the animator's talent in bringing characters to life through traditional techniques.

The other options suggest alternatives to this primary characteristic. For instance, while some modern animation techniques use computer-generated images, cel animation is distinctly about hand-drawn artistry. Sound design is an important aspect of any animated work but is not a defining characteristic of cel animation itself. Lastly, the notion that cel animation requires no prior artistic skills misrepresents the intricate skill set needed to create compelling animations in this style.