The concept of 'dilution'--bringing together healthy and mentally ill people to overcome the formation of a polarised and hierarchical society--was developed during the Nieuw Dennendal experiment at a Dutch mental healthcare institute in the 1970s. With this book we broaden the scope of what dilution could mean today, viewed through various historical, artistic, sociological and philosophical lenses. Could the historical concept of dilution be deployed as a contemporary artistic principle and be rediscovered as a means to achieve peaceful cohabitation? Does it have the potential to bridge and unify radical forms of otherness as part of an artistic process or perhaps life in general? The project 'The Dilution Adhesives' (2017), was made specially for this publication. Each copy contains a selection of stickers with images and illustrations from the Nieuw Dennendal archive, which is part of the collection of the International Institute of Social History in Amsterdam.