This book is devoted to the concept of horizontal art history-a proposal of a paradigm shift formulated by the Polish art historian Piotr Piotrowski (1952-2015)-that aims at undermining the hegemony of the discourse of art history created in the Western world. The concept of horizontal art history is one of many ideas on how to conduct nonhierarchical art historical analysis that have been developed in different geopolitical locations since at least the 1970s, parallel to the ongoing process of decolonization. This book is a critical examination of horizontal art history which provokes a discussion on the original concept of horizontal art history and possible methods to extend it. This is an edited volume written by international scholars who acknowledge the importance of the concept, share its basic assumptions and are aware both of its advantages and limitations. The book will be of interest to scholars working in art history, art historiography and postcolonial studies.