In our mind materiality is rather stereotypical. We imagine each material to have its own properties, like appearance, texture and surface feel. What happens when a material is changed extensivly but is used for similar objects? ALTER EGO is a series of large barrel shaped porcelain vessels, which went through diverse transformations in appearance and properties by adding different substances to the porcelain. Through manipulation of traditional production techniques different textures of porcelain were developed, which deviate from traditional porcelain both in surface and in chemical structure. For this project nearly 200 material experiments were performed.