“Important to science.” He turned to the Reversor, set its timer, turned several knobs, then, after hesitating for a moment, threw the switch. For several seconds Edith thought that nothing was happening. Then she heard a resonant hum rise to audibility inside the giant structure and began to feel a throbbing in the floor. She stared at the Reversor. The hum was rising in pitch and volume, the vibration in the floor increasing; she could feel it running up her legs, into her body. Power, she thought—the only thing that could oppose the house. She didn’t understand it, but feeling its heavy
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