sentences:  d'Alembert then goes on to describe the tree of knowledge and the separation and simultaneous connections between memory, reason, and imagination.He later explains that the ideal universe would be one gigantic truth if one only knew how to view it as such; the assumption that knowledge has intrinsic unity can be seen as the foundation of the project of making the encyclopedia.Part two of the book provides the reader with an account of the progress of human knowledge in the sequence of memory, imagination and reason.