Variable shape structure having bend members

A variable shape structure comprising:

• a first bend member having a first central coupling point, a first one-end coupling point, and a first other-end coupling point that are arranged so as to form a V shape with a fixed bend angle;
• a second bend member having a second central coupling point, a second one-end coupling point, and a second other-end coupling point that are arranged so as to form a V shape with a fixed bend angle, the second central coupling point being pivotally coupled to the first central coupling point of the first bend member;
• a third bend member having a third central coupling point, a third one-end coupling point, and a third other-end coupling point that are arranged so as to form a V shape with a fixed bend angle, at least one of the third one-end coupling point and the third other-end coupling point being coupled to one of the first one-end coupling point and the first other-end coupling point of the first bend member, wherein
• the structure forms a panel by coupling together a plurality of extendable arms that are adjacent in an X direction and a Y direction, wherein
• the second bend member is adjacent to the first bend member in the Y direction, wherein
• the third bend member is adjacent to the first bend member in the X direction, the third one-end coupling point being pivotally coupled to the first one-end coupling point of the first bend member,
• the structure further comprising:
• a fourth bend member having a fourth central coupling point, a fourth one-end coupling point, and a fourth other-end coupling point that are arranged so as to form a V shape with a fixed bend angle, the fourth bend member being adjacent to the second bend member in the X direction, the fourth one-end coupling point being pivotally coupled to the second one-end coupling point of the second bend member, the fourth central coupling point being pivotally coupled to the third central coupling point of the third bend member, wherein
• the first, second, third and fourth bend members each comprise linearly contiguous cross units to make up an extendable arm of the plurality of extendable arms, and wherein
• each of the cross units comprises a first linear member, a second linear member crossing the first linear member, and a pivot shaft via which the first linear member and the second linear member are pivotally coupled together at an intersection.