The Recollection Style is a collection of 14 books that make up part of the Crafting Motifs library. Reading these chapters allows access to the Recollection Style for crafting. Chapters (or rarely the entire book) are a possible drop from Aradros the Awakened in the Oathsworn Pit on Normal or Veteran mode. Chapters are a guaranteed drop in Veteran Hard Mode.
Learning all 14 crafting motifs earns the achievement The Recollection Style Master.