The concept of central void with a glass floor has an education aspect for the family. By using a glass floor, spatial transparency created by all the space can be connected and the children raised with an emphasis on living together. Owner decided to rebuild their homes after the addition of a new family member’s appropriate building regulations, 17 m groundfloor, first floor 13 m and 9 m saddle-roof. Responding to problems in the groundfloor lights, a central void has been created, cutting three floors, so that light can enter the house through a large skylight. In order not to lose the space, this void is filled with glass floors. Light-axis is set up and connect the entire life-different functions.