To form an objective summary of the story, the essential details to include are:
1. **A brief explanation of the events that happen during the story** - This outlines the main actions and occurrences that drive the narrative, such as the artist creating the picture and the animals learning about it from the cat.
2. **A sentence stating the theme of the story** - This captures the overarching message or moral that the fable conveys, which is typically a central element of fables.
So, the correct answers are:
- a brief explanation of the events that happen during the story
- a sentence stating the theme of the story