4.We may conjecture that psychological concept formation involves both vertical and horizontal processes. The vertical processes include the standard processes of concept formation, namely the generalization and abstraction of shared features of earlier formed concept to from new concept. Beyond this, we conjectures the existence of a psychological mechanism or tendency which transforms mental procedures or processes into objects. This mechanism changes a property , a construction, a process, or an incomplete collection into mental object, a complete thing-in-itself. What is represented as a process, a verb or an adjective becomes represented as a noun . This is ‘reification’ or ‘objectification’ . Psychologically , much concept formation has this character . Even in the act of coordinating different perception of an external object, in sensory concept formation, we reify the set of perception into the concept , an enduring object- representation in a schema.