Contents are those aspects of existence which are determined in themselves, but as such contain neither structure nor the possibility of being apprehended by us in their immediacy. Forms are the synthesizing principles which select elements from the raw stuff of experience and shape them into determinate unities. In this respect forms are identical with Kant's a priori categories of cognition; but they differ from the latter in two important respects. They inform not only the cognitive realm, but any and all dimensions of human experience. And they are not fixed and immutable, but emerge, develop, and perhaps disappear over time.

DEFINE: Defines 'contents' versus 'forms' and distinguishes forms from Kant's fixed a priori categories, emphasizing their dynamic, cross-domain nature. XREF: Connects to Kantian epistemology and category theory; the idea of forms as mutable synthesizing principles echoes sociological/symbolic form traditions (e.g., Cassirer).

XREF: This is clearly Simmel's reformulation of Kant's categories — extends them beyond cognition and makes them historically dynamic. DEFINE: Distinguishes contents (undetermined raw existence) from forms (synthesizing, dynamic a priori principles). Builds on: "Academic marginality fostered Simmel's original philosophical thinking."

Georg Simmel, on individuality and social…, loc. 21