Among the different modes of existence that Étienne Souriau cataloged at the end of the 30s and the beginning of the 40s, one of them caught his attention: virtual existences. All his research, at the intersection between philosophy and art, was touched by this finding. These existences, at the limit of non-existence, and renamed by David Lapoujade as "minors", are not because of their insignificance, even though they always and forever run the risk of not being taken into account. On the contrary, the "minor" is a potential, a positivity, a virtual full of possible ... as long as their right to exist is recognized. It is then a case of jurisprudence that will decide on them, since it is an invisible fact, invisible, or at least not recognized by the law of the visible. This right to exist will need witnesses and defense attorneys, since their litigation is the most difficult. And it will demand a new way of seeing, of perceiving, of populating ... and surely, of fighting. Lapoujade will pursue these existences - and the way of perceiving them - by diverse lands, from the literature of Pessoa, Proust, Kafka, Henri James or Beckett to that of Don Quixote himself, but also in painting, in music, or in journeys of the current photograph. "Minor" stocks, or fragile, evanescent, spectral. Since feeling his presence, Spinoza would say, is as rare as it is sublime. Far from the beings of fiction and "next to" the things and phenomena we notice, these existences live in the manner of a halo, a breeze, or a haze that looms.