Final answer:
The skull imagery in 'Vanitas Still Life' represents the vanitas theme, symbolizing the fleeting nature of life. It serves as a moralistic reminder of the brevity and meaninglessness of earthly existence.
Step-by-step explanation:
In the artwork 'Vanitas Still Life' by Van Oosterwyck, the skull imagery holds great significance. It represents the vanitas theme, which is commonly found in still life paintings of the 17th century. The vanitas theme symbolizes the fleeting nature of life and serves as a moralistic reminder of the brevity of life. In this context, the skull imagery in the artwork emphasizes the transience and meaninglessness of earthly existence.