A yellow square receding within boxes of black lines against a blue background; advertising ZIK, Zuhause im Kiez gGmbH, an organisation which helps to house people with HIV, AIDS or chronic hepatitis C. Colour lithograph.

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A yellow square receding within boxes of black lines against a blue background; advertising ZIK, Zuhause im Kiez gGmbH, an organisation which helps to house people with HIV, AIDS or chronic hepatitis C. Colour lithograph. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.