Thomas Edison's laboratory facility in Menlo Park most closely resembled a factory. The laboratory itself was one large open room with high ceilings made of narrow wood planks. A brick fireplace protruding from one wall provided heat for the dimly lit facility . However, this dull facade was merely a mask behind which hid the face of invention. Which technique of fiction is used in this nonfiction excerpt? 1 Literary allusion is used to compare Edison's laboratory to a mythological setting 2 Personification is used to suggest the importance of the building to Edison. 3 Metaphor is used to express that the work being done was more interesting than the building suggested