Introduction When Flann O'Brien's first novel At Swim-Two-Birds was published on 13th March 1939, it was immediately hailed as a work of genius. Admired by a long list of eminent personalities, among whom James Joyce topped the list for decades, it has been widely considered as O'Brien's finest literary creation along with The Third Policeman, written in 1940 and posthumously published in 1967. He also published The Poor Mouth (1941, originally in Irish and entitled An Beal Bocht), The Hard Life (1961), and The Dalkey Archive (1964), the latter being a rewriting of The Third Policeman with certain modifications and additions. Both At Swim-Two-Birds and The Third Policeman have been constant objects of study and research due to their innovative, early-postmodernist experimentation; perhaps even The Poor Mouth could fit into that category (1) given its politically idiosyncratic content which has attracted many commentators interested in the Irish nationalist movement during the 1940s. However, neither the rest of his novels nor his vast, long-running column entitled Cruiskeen Lawn, published almost daily from 1940 to 1966, have received sufficient critical appraisal compared to O'Brien's main novels. (2) Whereas At Swim-Two-Birds takes modernism to its limit through metafiction, exploring the intricacies of fiction and redefining the concept through the narration of an undergraduate Dublin student and novice writer, The Third Policeman molds them into postmodernism through "fragmentation and indeterminacy" (Hopper 2011: 13). Be that as it may, in the case of these two novels it seems that O'Brien's imaginative engine was working at maximum speed, whereas The Hard Life, succinctly introduced as "O'Brien's most normal picture of reality" (Clissman 1975: 272) or The Dalkey Archive seem to take a step backwards to certainly still comic, but allegedly inferior realism. Just a few years after the publication of At Swim-Two-Birds, many readers were claiming that this novel would remain as O'Brien's best work ever and that Cruiskeen Lawn, a project which O'Brien--under the pseudonym of Myles na gCopaleen was so intently committed to, had done nothing but to cut a brilliant and promising literary career short; not to mention the consideration of The Poor Mouth as being nothing but an empty satirical attack towards Irish language revival, thus lacking on artistic worth (Cronin 1990: 179). This issue has been a frequent source of doubt among scholars: why are At Swim-Two-Birds and The Third Policeman so avowedly brilliant compared to the rest of his output? Moreover, what are the reasons for this apparent loss of effervescence in his writing in later years? It is indeed not possible to address the problem in a straightforward way. There were many reasons for this apparent creative decline: personal and financial problems, official obstacles and social and cultural interventions. I contend, however, that one of the facts that might have caused O'Brien's fertile imagination to fall into disuse lies at the state of culture at that time in Ireland: (3) it was an essentially provincial country whose political determination to forge a culture and ideology of its own was not everybody's cup of tea--indeed, it was not O'Brien's -, and on top of that there were the typical problems that an Irish writer had to struggle with, such as censorship or a still illiterate audience. Ireland, a country whose recently achieved absolute independence--by means of the Constitution of 1937--was put into test by World War II, did actually flourish in terms of artistic and intellectual development during the conflict. Many important literary figures did their finest work during this time, such as Sean O'Faolain, Frank O'Connor, Elizabeth Bowen or Patrick Kavanagh. Why, then, given this impressively fertile literary background, did O'Brien's literary achievements seem to be moving backwards instead of forwards? This article will try to shed some light on the issue by following O'Brien's literary career starting at the 1930s with his university years and the publication of At Swim-Two-Birds, going all the way through his literary activities during the 1940s and 1950s, and ending up with his two last published novels, The Hard Life and The Dalkey Archive, taking special interest on the cultural atmosphere which impregnated those decades and how it could have affected O'Brien's creativity. …