Abstractionism is the theory that the mind obtains some or all of its concepts by abstracting them from it already has, or from experience .  One may, for example, abstract ‘green’ from a set of experiences which involve green along with other properties . Also, for example, a generic concept like ‘vegetable’ from the already possessed concepts of its instances (carrot, broccoli, onion, etc.). This view was criticized by George Berkeley  and Peter Geach . 
- ^ Jump up to:a b Geach, Peter (1957) Mental Acts – Their Contents and Their Objects. Routledge Kegan Paul.
- Jump up^ Flage, Daniel (1986). “Berkeley on Abstraction” . Journal of the History of Philosophy . 24 (4): 483-501. doi : 10.1353 / hph.1986.0073 .