Final answer:
The Gothic theme found in The Feather Pillow is a sense of horror and the supernatural, displayed through the eerie atmosphere created by the pillow filled with the feathers of a dead bird.
Step-by-step explanation:
The Gothic theme that can be found in The Feather Pillow is a sense of horror and the supernatural. This can be seen in the story through the eerie and mysterious atmosphere created by the feather pillow. The protagonist's wife becomes sick after resting her head on the pillow, and it is revealed that the pillow is filled with the feathers of a dead bird.
This element of the supernatural and the macabre is a characteristic of Gothic literature. It adds tension and suspense to the story and creates a sense of unease and fear for the reader.