It was a Scandinavian artist from Denmark.
The creature that Harry's class had to navigate when crossing a series of potholes were the red caps, which are dwarf-like that inhabit places like underground holes and battlefields and places where human blood has been spilled, like the dungeons of a castle.
They were small creatures that looked like elves, were three feet tall, had red eyes and sharp nails, and attacked anyone who invaded their territory and lost people.
The red caps were inspired by mythology, which says that these dwarf attack travelers who invade their territories, murdering them and staining their hat with blood.
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The answer is D. Reminds the viewer of the transience of life and material possessions.
