Les Enfants du limon – Children of Clay in the translated version – is Raymond Queneau's fifth novel, which is a fictionalisation of a book considered to be unpublishable: 'Encyclopédie des sciences inexactes', on which Queneau had spent four years. The subject of the unpublished book (and the central subject of the published book) is 'fous littéraires', a term which has unfortunately often been translated as 'literary madmen', 'literary lunatics', and equally inaccurate expressions when 'outsider writers' would cover it far more politely, and far better.
Queneau restricts himself to nineteenth century fous littéraires/outsider writers: before that period misunderstandings could get in the way of definitions, and of course when he began writing the twentieth century wasn't even through its first third. But within the chosen century there are also limitations as to who should or shouldn't be placed in the category of fou littéraire/outsider writer, although the boundaries may change because this is after all a working copy (now within a novel, that is):
Links to my other Queneau post, my post on Blavier's book, and Queneau's grave:
Raymond Queneau: Exercices de style
André Blavier: Les Fous littéraires
Queneau's grave, Juvisy-sur-Orge