Balanced on a cherry tree at almost four meters heights, Bat House stands out in the open space near Building 3 in Midorigaoka Area and offers refuges for bats. The concept of balance is inspired by animals behavior and get along with the interplay of forces that characterize trees from roots to leaves. The new appendage is based on a singular repeated construction system that, working on other parameters, generates variation of parts. The joints have not only structural function but are also the matrix of the spaces that bats need.