It may be held that they exist merely as conceptions in our minds; this is Nominalism or Conceptualism.
The nature of the resultant concepts belongs to the great controversy between Nominalism, Realism and Conceptualism.
While it asserted a realism of individuals, it admitted a conceptualism of universals.
Often, it seems like he has managed to merge high-end conceptualism with the kind of low-end practical photography undertaken by surveyors or architects.
Even Abelard's mediating doctrine of conceptualism was sufficiently near to obnoxious ideas to involve him in lifelong persecution.