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Although vision is the de facto model system of consciousness research, studying olfactory consciousness has its own advan-tages, as this collection of articles emphatically demonstrates. One advantage of olfaction is its computational and phenomenologi-cal simplicity, which facilitates the identification of basic princi-ples. Other researchers study olfactory consciousness not because of its simplicity, but because of its unique features. Together, olfaction’s simplicity and its distinctiveness make it an ideal sys-tem for testing theories of consciousness. In this research topic, the results of recent research into olfactory consciousness are presented. SIMPLICITY OF OLFACTION The relative simplicity of olfaction makes it a natural starting point for investigating perception. Olfaction has been used as a theoretical launchpad at least since 1764, when Reid wrote tha