Before keyframe animation, animators had to draw every frame of a movement, which was time-consuming and tedious. They also had to rely on trial and error to achieve smooth and consistent results. By the 1910s, animators had begun to experiment with a new method that involved drawing only the main poses of a movement, called keyframes, and then filling in the gaps with intermediate frames, called inbetweens. This way, they could focus on the timing, spacing, and dynamics of the movement, and delegate the inbetweening to less experienced artists or machines. Such "keyframe animation" was introduced in 1914 with Winsor McCay's Gertie the Dinosaur. And in the late 1920s, Disney animators began to further experiment with the technique. (This section has been updated by LinkedIn editors based on member feedback.)