The top of the Umbra Side Table is constructed by joining together tiny "Penrose Prototiles" in solid walnut, named after Sir. Roger Penrose, a famous British mathematician who first investigated them in 1970s. The designer joined the prototiles in the table top in a way to create an abstract tree shade. Umbra table is made of small pieces of walnut wood, left over in furniture production. A walnut tree needs 80 to 100 years to grow. It is beautiful in its natural state and every little part is valuable. What will otherwise be a waste in production process is used to make this table.
Umbra Table was awarded the Interior Innovation Award in 2012.
Manulution buys walnut and cherry logs from private orchards throughout Bosnia. These are trunks of old trees, which are cut when their productive life of fruit bearing is over and need to be replaced by new ones. They are bought directly from villagers, often in very small quantities, whenever it is offered. Other hardwoods (i.e. maple, oak, elm, and ash) are sourced from public forestry companies, the management of which has vastly improved in recent years. The forest certification process has started and several forests are FSC certified. There is also concrete evidence that forests are exploited sustainably. A recent forestry inventory (financed and supported by the World Bank) has shown that Bosnia's forest volume has increased significantly since the last inventory was conducted in 1960s. In fact, the study indicated that Bosnia, ostensibly, has more trees per capita than any country in Europe or Central Asia.