The same way a librarian traditionally organizes books according the alphabet, this shop organizes everything according to Astro-Qabalistic symbolism. Qabalah, among other things, is a medieval system  of organizing and unifying astronomy, astrology, alchemy, mythology and proto-psychology.
Every item in a horizontal row are associated with and symbolize each other. The first 7 rows are the primary aspects the store is organized according to.

The symbolism in these charts was decided on based on the following occult books. 
777 by By Aliester Crowley
The Complete Magicians Tables by Stephen Skinner
Spagyrics by Manfred M Junius
The New Hermetics by Jason Newcomb