There is a trace of timeless arithmetic validity in the work of Ruth Maria Obrist. Her objects and installations explore themes such as mathematics - chaos and order - space, void, proportion, and volume. Over the years, the ocean, too, caught between beauty, destruction and healing, has been a central theme. Ruth Maria Obrist's works are of a profound materiality. Using bitumen, white glue, mercuchrome, gold or rust, she creates sensory surfaces that - formally reduced to the essential - exude a poetic ease. This book covers works from the years 2000 to 2021, including some of the numerous projects that Ruth Maria Obrist realised together with architects and in public spaces.