T-Box is a multifunctional building block system whose basic modular element is a 40 x 40 cm sized box. On the inside is a T-shaped handle, which not only facilitates transportation, but also increases stability. A single box can be used as a coffee table, stool or storage space. Several modules can be combined to create a bookshelf of any size desired, a lowboard or a semi-transparent room divider. The elements are connected with the help of X-shaped connectors that ensure the stability of the construction. The system can be extended and enlarged at will if the need arises.