Which animated series is recognized for its fluid realistic movement and the combination of animation with live action?

The animated series recognized for its fluid realistic movement and the combination of animation with live action is "Out of the Inkwell." This series, created by Max Fleischer, is famous for its innovation in blending animated characters with real-life footage. It showcased a unique technique where characters, such as Koko the Clown, would interact seamlessly with live-action actors and environments. This integration was revolutionary during its time and contributed significantly to the evolving aesthetic in animation, emphasizing both artistic fluidity and a new form of storytelling that brought animated elements into the realm of reality.

The series is emblematic of the early 20th-century experimentation in animation and is often celebrated for its pioneering contributions to the medium. The fluidity of movement in these animations was a standout feature, achieved through meticulous artistry and inventive techniques that made characters appear more lifelike in their interactions.