As the combination of the very high with the very low, the term was introduced by Alexander Pope in his essay Peri Bathous, Or the Art of Sinking in Poetry (1727). On the one hand, Pope's work is a parody in prose of Longinus' Peri Hupsous (On the Sublime), in that he imitates Longinus's system for the purpose of ridiculing contemporary poets, but, on the other, it is a blow Pope struck in an ongoing struggle against the "dunces."
The nearest model for Pope's essay is the Treatise of the Sublime by Boileau of 1712. Pope admired Boileau, but one of Pope's (and Swift's) enemies, Leonard Welsted, had issued a "translation" of Longinus in 1726 that was merely a translation of Boileau. Because Welsted and Pope's enemies were championing this "sublime," Pope commented upon and countered their system with his Peri Bathos in the Swift-Pope-Gay-Arbuthnot Miscellanies. Whereas Boileau had offered a detailed discussion of all the ways in which poetry could ascend or be "awe-inspiring," Pope offers a lengthy schematic of the ways in which authors might "sink" in poetry, satirizing the very men who were allied with Ambrose Philips. Pope and Philips had been adversaries since the publication of Pope's Odes, and the rivalry broke down along political lines.
One example of Pope's style and satire shows in his description of sinking in painting. In the commonplace Augustan hierarchic ranking of pictorial genres, still life ranked the lowest. However, Pope describes how it might fall and, with the single word "stiffen," evokes the unnatural deadness that is a mark of failure even in this "low" genre:
Although Pope's manual of bad verse offers numerous methods for writing poorly, of all these ways to "sink," the method that is most remembered now is the act of combining very serious matters with very trivial ones. The radical juxtaposition of the serious with the frivolous does two things. First, it violates "decorum," or the fittingness of subject, and, second, it creates humor with an unexpected and improper juxtaposition.
Since Pope's day, the term "bathos," perhaps because of confusion with "pathos," has been used for any artform, and sometimes, any event where something is so pathetic as to be humorous.
When artists consciously mix the very serious with the very trivial, the effect is the absurd and absurd humor. However, when an artist is unconscious of the juxtaposition (e.g., when a film maker means for a man in a gorilla suit with a diving helmet to be frightening), the result is bathos.
Arguably, some forms of kitsch (notably the replication of serious or sublime subjects in a trivial context, like tea-towels with prints of Titian's Last Supper on them or handguns that are actually cigarette lighters) express bathos in the concrete arts.
A tolerant but detached enjoyment of the aesthetic failure that is inherent in naive, unconscious and honest bathos is an element of the camp sensibility, as first analyzed by Susan Sontag, in a 1964 essay "Notes on camp"
Pope himself employed this type of figure intentionally for humor in his mock-heroic Rape of the Lock, where a lady would be upset at the death of a lover "or lapdog." Soren Kierkegaard, in The Sickness Unto Death, did the same thing, when he suggested that the "self" is easy to lose and that the loss of "an arm, a leg, a dog, or a wife" would be more grievous. When intended, this is a form of satire or the literary figure of undercutting. When the context demands a lofty, serious, or grand interpretation, however, the effect is bathos.
In 1764, William Hogarth published his last engraving, The Bathos, or the Manner of Sinking in Sublime Paintings inscribed to Dealers in Dark Pictures, depicting Old Father Time lying exhausted in a scene of destruction, parodying the fashion at that time for "sublime" works of art, and satirising criticisms made of Hogarth's own works. It may also be seen as a vanitas or memento mori, foreshadowing Hogarth's death six months later. Headed Tail Piece, it was intended as the tailpiece for a bound edition of Hogarth's engravings.
Some of the above, and others, circulated as High School Analogies, such as: