Read the passage and note the bolded sentence. From the Introduction to Frankenstein Night waned upon this talk, and even the witching hour had gone by, before we retired to rest. When I placed my head on my pillow, I did not sleep, nor could I be said to think. My imagination, unbidden, possessed and guided me, gifting the successive images that arose in my mind with a vividness far beyond the usual bounds of reverie. I saw—with shut eyes but acute mental vision—I saw the pale student of unhallowed arts kneeling beside the thing he had put together. I saw the hideous phantasm of a man stretched out, and then, on the working of some powerful engine, show signs of life and stir with an uneasy, half vital motion.
Mary Shelley uses the images that come to her mind unbidden to create a classic Gothic story. Which characteristic of the Romantic Movement does this process reflect?

an emphasis on visions
a high value on creativity
a high value on imagination
an emphasis on the unnatural