Only by reducing principles can they be understood and related to each other. Ultimately, from a high "vantage point" (47) the philosopher can then view the vast labyrinth of sciences and the arts. d'Alembert then goes on to describe the tree of knowledge and the separation and simultaneous connections between memory, reason, and imagination.
To grasp principles, we must first simplify them. From a high perspective (47), the philosopher can then see the interconnectedness of all sciences and arts. d'Alembert describes this as a "tree of knowledge" with separate branches for memory, reason, and imagination.