The Ecobank at Gärdsmossen started 15th of september 1997 when ten oakloggs was sunked to the aquatic milieu of a swampland. The purpose is through the help of microbs and lack of oxygen to make the valuable and naturally produced blackoak. The nature stores and maximizes here in its own way, it´s own material. This also makes the plays, that is, into a ecobank in the swampland Gärdsmossen. The process of turning the oakloggs to blackoak takes between 100–300 years. This timespan make blackoak an precious and valuable item. From an aesthetical and practical point of view, there is a maximation of value from ordinary oak to blackoak. This artaction shows a possibility of a longlasting and bearable ecological process and an economic alternative way of thinking on the basis of the natures own possibilities.Gothenburgs most unvisible an anonymously public artpiece, The Ecobank of Gärdsmossen, is growing in a resturated swamp at Bergsjön (a subburb north of Gothenburg, Sweden).