Grenouille's inner world (also referred to as his fortress, inner palace, or purple room) is where Grenouille keeps all of his scents catalogued and is a place where he has complete control as “Grenouille the Great.” Thus, Grenouille's inner world can be seen to represent both how Grenouille conceptualizes himself and illustrates how he'd like the world to be. Grenouille the Great is capable of molding this inner world to look and smell exactly how Grenouille wants, a power that Grenouille seeks to gain over the outside world. Further, while Grenouille the Great's world has servants to wait on him, they're invisible and don't smell, and in the same vein, the girl from the rue de Marais features in Grenouille's world as bottles of scent to be drunk. This fleshes out and illustrates Grenouille's misanthropic view of people; he sees them as items to be used and enjoyed rather than as actual beings.
Grenouille's Inner World Quotes in Perfume
... he clapped his hands and called his servants, who were invisible, intangible, inaudible, and above all inodorous, and thus totally imaginary servants...
That odor had been the pledge of freedom. It had been the pledge of a different life. The odor of that morning was for Grenouille the odor of hope. He guarded it carefully. And he drank it daily.
What he now felt was the fear of not knowing much of anything about himself... He could not flee it, but had to move toward it.