Research in Roman interior design and wall painting has undergone two major shifts in the past century. The first, in the 1980s, steered away from the tradition of purely art historical studies that had elucidated the basic principles of artistic developments, iconographies, and pictorial programs. Instead, researchers focused on the Roman house as a social space, with private and public zones inhabited by individuals of different social standing. The second shift, occurring in the new millennium, saw researchers returning to the decoration of the house; however, they were now more intrigued by the cognition and reception of the paintings and how they were conceived to create atmospheres, mnemonic paths, and impressions on their viewers. Simultaneously, important insights into the often-multifunctional use of space were provided by finds analysis.