Module assembly

A module comprising:

• a polyhedral housing with a polygonal plane;
• a pin provided on one side of a corner of the housing;
• a pin installation portion in which the pin is movable between a first position and a second position;
• a pin receiver provided on another side of the corner of the housing such that a pin of other module is to be inserted thereinto;
• and
• a first magnet installed between the pin installation portion and the pin receiver,
• wherein the pin moves between the first position and the second position based on magnetic force applied by the first magnet of the module to the pin and magnetic force applied by a second magnet of the other module to the pin, and
• wherein the pin is in the first position if the magnetic force applied by the first magnet of the module to the pin is greater than the magnetic force applied by the second magnet of the other module to the pin.

A module assembly comprising:

• a first module and a second module disposed to be spaced apart from each other;
• and
• a third module to be coupled to the first module and the second module while being in surface contact therewith,
• wherein, each of the first module, the second module, and the third module comprises:
• a pin installation portion inside the each of the first module, the second module, and the third module;
• a pin movable in the pin installation portion, the pin being either in a first position where an entire of the pin is within the pin installation portion or in a second position where a part of the pin protrudes outside the pin installation portion based on magnetic force applied to the pin;
• and
• a magnet configured to apply the magnetic force, wherein the pin provided in one of the first module, the second module, and the third module moves from the first position to the second position if the magnetic force applied by the magnet provided in the one of the first module, the second module, and the third module to the pin becomes less than the magnetic force applied by the magnet of another of the first module, the second module, and the third module to the pin,
• wherein the third module is coupled to the first module when a pin provided in one of the first module and the third module protrudes and fits in a pin receiver provided in the other of the first module and the third module,
• the third module is coupled to the second module when a pin provided in one of the second module and the third module protrudes and fits in a pin receiver provided in the other of the second module and the third module, and
• the pins are configured to protrude when the third module fits in between the first module and the second module.