Here’s an interpretation of “The Jar.” Take it with a grain of salt.
The story can be read (whether or not Bradbury meant it to be so read) as commenting on the vulgarity of horror fiction. Since the story itself is a gruesome horror fiction, this reading is ironic.
Charlie is not much respected by his rustic peers, including his sexy wife Thedy. Aware of his own fascination with the carnival jar, he realizes that others too won’t be able to help staring and coming back to stare, if he can persuade the owner to sell it. Taking advantage of Charlie, the carny owner sells it to him for $12. The “ingredients” of this attraction are cheap. Later we learn that the assemblage was worth only a couple of dollars, in the seller’s opinion. The “artistry” of whoever put the ingredients together (the carny man himself?) does work, however.
The story shows that Charlie was right. The repulsively fascinating thing in the jar brings visitors to his house again and again. Their imaginations are tickled: what on earth
is it, anyway? Charlie relishes attention he gets on account of his property. (When it is threatened with exposure, however, as just an assemblage of cheap ingredients, he acts in desperation, removing the threat of exposure and continuing and even enhancing the attraction of the jar.)
The audience for the jar (the other rustics) is viewed patronizingly. They are vulgar gawkers. Yet the original jar does activate their imaginations, and there is a poetic quality to some of the thoughts and feelings that they try to articulate, notably in the case of the woman who thinks the thing in the jar might be her long-lost boy Foley and the man who suspects it is “the center of creation,” the primeval mass from which other life-forms are derived. Of course the construction is none of these things and we are amused by how the rustics are fooled. They have to
be rustics for the story to work.
And so the story can be read as even a satire poking fun at horror fiction, at the perennial appetite for sensational, grotesque monsters concocted from the cheapest of ingredients and lapped up by people with a taste for nothing better; and yet the story allows that, even so, glints of “poetry” may be struck….