Res, ens and aliquid
There are conceptual distinctions that have been repeatedly introduced into philosophical reflection and that have been correspondingly disappeared into nothingness without leaving a visible trace of their presence. The systematic constant disappearance of these distinctions after short periods of presence means perhaps that it is a question of false distinctions. But the fact that they keep on appearing again in different philosophical contexts, theories and systems perhaps sends us back to the presence of a theoretical impasse or of a conceptual knot which is not solved yet.
Poli, R. (1996)., Res, ens and aliquid, in R. Poli & P. Simons (eds.), Formal ontology, Dordrecht, Springer, pp. 1-26.
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