Answer:
The mirror through which Dr. Heidegger's deceased patient's stare, magical book, skulls in the closet.
Explanation:
"Dr. Heidegger's Experiment" is a short story written by Nathaniel Hawthorne. The setting of the story is creepy and eerie study of Dr. Heidegger.
Hawthorne took much time and delight in describing the study of Dr. Heidegger. The study of Dr. Heidegger was accustomed to supernatural elements.
The supernatural elements were:
These details that Hawthorne provides suggest that the setting was supernatural.