In the 19th century the philosophies of the Enlightenment began to have a dramatic effect, the landmark works of philosophers such as Immanuel Kant and Jean-Jacques Rousseau influencing a new generation of thinkers. In the late 18th century a movement known as Romanticism began, it validated strong emotion as an authentic source of aesthetic experience, placing new emphasis on such emotions as trepidation, horror and terror and awe.
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