Background: Japanese EFL learners often fail to identify and categorise the different degrees of certainty associated with CERTAIN, PROBABLE, and POSSIBLE items. This computer-mediated study evaluated the relative effects of animated versus static illustrations on stimulating the spatial concept of distance for the acquisition of this knowledge. Objectives: This study aimed to: (1) discover whether the spatial concept of distance captured by three-dimensional (3D) images in animated or static illustrations help learners understand spatial relationships more clearly, and (2) whether a static illustration is sufficient for learning the different degrees of certainty. Method: Animated and static visualisation groups used 3D images of animated versus static illustrations that capture the spatial concept of distance, and a contrasting group did not use illustrations. The former applied the spatial concept of distance to learn the degrees of certainty, using animated or static illustrations. A spatial concept-oriented approach that visualises concepts of distance enabled participants to understand the degrees of certainty. The contrasting approach involved rote learning of a list of target expressions for the different degrees of certainty in English. Results and Conclusions: Both the animated and static versions of the spatial concept-oriented approaches were equally effective. The difference between the two versions did not significantly impact the overall performance of the groups. Takeaways: Regardless of the type of effect, the spatial concept of distance captured in words and illustrations helped the participants (1) process the different degrees of certainty cognitively in terms of distances and (2) retain them in long-term memory.