Abstract
This chapter proposes to take the first few steps toward understanding the problematics of imagination in Descartes. It aims to show that in writings preceding the Regulae, Descartes conceived imagination as the chief faculty in the work of cognition, indeed the chief faculty for unifying knowledge. In this light the Regulae appears not simply as an early formulation of the principles of method, but as the tension-filled outcome of an attempt to think through the heuristic and cognitive competencies of imagination on the basis of a human psychology strongly correlated with human physiology. Although the inadequacies of this attempt ultimately led to the cognitive demotion of imagination, there are nevertheless reasons for thinking that the early framework, shaped by the primacy of imagination, was not so much rejected as transformed in Descartes' mature work. The chapter further explains that imagination is the foundation of physics and mathematics and that it is both corporeal and spiritual. In addition imagination also serves as agent of all intelligent perception and the chief faculty for rising to higher level of spiritual truths. It further explains phantasia, a crucial organ of the brain where images occur, either derived from the senses, memory or from the intellect.