m3a,6 (dark study)

We ask in this passage, what are the "relations" the idler loves to enter into with the demimonde? This isn't clear, other than to say a relation of identity, the idler is "of" the demimonde. And here it's probably important to keep each nuance of the term, including it's literal meaning of "half world", in mind. From Wikipedia:

Demi-monde refers to a group of people who live hedonistic lifestyles, usually in a flagrant and conspicuous manner. The term was commonly used in Europe from the late nineteenth to the early twentieth century, and contemporary use has an anachronistic character. Its connotations of pleasure-seeking often contrasted with wealth and ruling class behavior. The term 'demi-monde' is French for "half-world". It derives from a comedy called Le Demi-Monde, by Alexandre Dumas, fils, published in 1855. The term was often used as one of disapprobation, the behavior of a person in the demimonde being contrary to more traditional or bourgeois values. Such behaviors often included drinking or drug use, gambling, high spending (particularly in pursuit of fashion, as through clothing as well as servants and houses), and sexual promiscuity. The term demimondaine referred to a woman who embodied these qualities; later it became a euphemism for a courtesan or prostitute.

This dark, half-world defines the idler and idling. Picking up from m3a,5, this is a world of "sensation," and specifically where the body is for sale. This is also a kind of undercommons, to which "study" gives a cover, that cover itself providing a kind of access. With this positioning of study it becomes clearer that the Arcades Project is not about simple access to "imaginative reading" or other ideas of language, though that movement is present in what is happening. Here study is a kind of lie, something false, intended to produce something else (consider this definition of study in the university context). And we can note here that the demimonde, the bohemian, the idler, the underworld, no longer exist in developed bourgeois society, but part of the point here is that they will have transformed into something else. Sensation will always have this element circulating.