Designed by Danish designer Sofie Østerby, the OSO Bowl is cast by hand in dark high-alumina cement and finished with a clear hard wax. Its low, substantial form highlights the weight and texture of the material, allowing it to function as both a bowl and a decorative object.

The casting process gives each piece its own surface variations and irregularities. These differences are a natural part of the material and production method, and the appearance may change subtly over time.