The book of Leviticus is the very heart of the Torah.
That is because it describes the intimate meeting of man and G-d in the courtyards and inner sanctums of the Holy Temple/Tabernacle.
To meet and share the same "space" in creation with man was G-d's intention from even before the very beginning.
The establishment of the Tabernacle and the initiation of the Divine service is the completion and perfection of creation.