Modular toy block system

A modular block toy, comprising:

• a male cubic unit piece having a geometric shape of a cube with six side faces and a male node extending from each side face of the six side faces, each male node having a same size and shape centered on each side face of the six side faces, each male node having four sides with four corners, and each male node having an exposed face that is sized to be smaller than the face on the male cubic unit piece from which it extends to form a continuous face orthogonal to and extending entirely around the four sides and four corners of the male node;
• and
• a female cubic unit piece having a geometric shape of a cube of the same scale as the male cubic unit piece, the female cubic unit piece having six side faces with eight corners, each corner formed by an intersection of three orthogonal side faces, each side face having a female component formed thereon that is sized and shaped to receive a respective male node from the male cubic unit piece with only an interference fit, each female component having a bottom wall that is an exposed portion of the respective side face, and each female component having a configuration that is selected from a group consisting of:
• (a) a cross-shaped channel with a planform shape of a cross that is sized and shaped to receive a respective male node from the male cubic unit piece with only an interference fit thereby enabling the female piece and multiple male cubic unit pieces to be connected together with complete contiguity using any side face of the six side faces of the female piece and to allow multiple female pieces to be attached to any side face of the six side faces of the male piece, and to enable manual assembly by the human hand only without the aid of fasteners, tools, and other mechanical devices or means, the cross-shaped channel formed of first and second channels that intersect in a center of the cross-shaped channel at a 90-degree angle, each of the first and second channels having a first end and a second end, and each of the first and second channels having first and second pairs of opposing side walls extending from the bottom wall, with the first pair of opposing side walls located at the first end of the first and second channels and the second pair of opposing side walls located at the second end of the first and second channels;
• (b) a T-shaped channel with a planform shape of a T that is sized and shaped to receive a respective male node from the male cubic unit piece with only an interference fit thereby enabling the female piece and multiple male cubic unit pieces to be connected together with complete contiguity using any side face of the six side faces of the female piece and to allow multiple female pieces to be attached to any side face of the six side faces of the male piece, and to enable manual assembly by the human hand only without the aid of fasteners, tools, and other mechanical devices or means, the T-shaped channel formed of a first pair of channels that intersect a third channel at a 90-degree angle, the first pair of channels comprising first and second channels having a respective first and second pair of opposing side walls extending from the bottom wall, with the first pair of opposing side walls forming the first channel the second pair of opposing side walls forming the second channel, and the third channel formed of a single pair of opposing side walls extending from the bottom wall;
• and
• (c) a single straight channel that is sized and shaped to receive a respective male node from the male cubic unit piece with only an interference fit thereby enabling the female piece and multiple male cubic unit pieces to be connected together with complete contiguity using any side face of the six side faces of the female piece and to allow multiple female pieces to be attached to any side face of the six side faces of the male piece, and to enable manual assembly by the human hand only without the aid of fasteners, tools, and other mechanical devices or means, the single straight channel having an open first end and an open second end, and a first pair of opposing side walls extending from the bottom wall between the open first and second ends.