"The term “picturesque” needs to be understood in relationship to two other aesthetic ideals: the beautiful and the sublime. By the last third of the 18th century, enlightenment and rationalist ideas about aesthetics were being challenged by looking at the experiences of beauty and sublimity as non-rational. Aesthetic experience was not just a rational decision – one did not look at a pleasing curved form and decide it was beautiful; rather it came naturally as a matter of basic human instinct. Edmund Burke in his 1757 A Philosophical Enquiry into the Origin of Our Ideas of the Sublime and Beautiful argued that the soft gentle curves appealed to the male sexual desire, while the sublime horrors appealed to our desires for self-preservation. Picturesque arose as a mediator between these opposed ideals of beauty and the sublime, showing the possibilities that existed between these two rationally idealised states."
~ James Buzard: The Grand Tour and after (1660–1840)