This study investigated the development of computational thinking (CT) in young children within the specific context of Hong Kong. The researchers utilized an unplugged digital arts activity to explore the CT knowledge exhibited by children and document their developmental trajectories. A sample of 23 children aged 3 to 6 years participated in an animation art workshop conducted in a Hong Kong kindergarten. The video data were recorded and analyzed in terms of content. Drawing on a three-dimensional framework combining powerful ideas for teaching coding, the observations and field notes revealed that children's CT knowledge construction aligned with the CT conceptual framework. Notably, older children demonstrated more advanced competences and more complex cognitive structures in terms of the design process, representation, algorithms, modularity, sequences, connecting, choices of conduct, and utilization of hardware/software. These findings emphasize the importance of designing age-appropriate curricula that foster children's CT skills through the animation art.