A coupling toy, system, and kit is provided. In certain embodiments, the coupling toy may comprise a top surface and a bottom surface. The bottom surface may have one or more recesses sized to frictionally engage one or more studs along a toy platform. In some embodiments, the top surface may be connected or coupled to a toy character, such as a human-like toy, an animal-like toy, a toy building structure, or a portion of a toy building structure. The coupling kit may comprise a toy platform having a top surface with one or more studs disposed in a parallel matrix, and at least one toy figure having a top surface and a bottom surface. The top surface of the toy figure may be connected to a toy character or a toy building structure. The bottom surface of the toy figure may comprise one or more recesses sized to frictionally engage the one or more studs.

An environmentally friendly knockdown building block set includes a cardboard shipping box; a plurality of main cardboard blanks each configured to form a base block including four connecting slots therein as wide as the base block thickness; a plurality of coupling cardboard blanks each configured to form an H-block including two connecting slots therein with each slot located between two legs of the H-block and as wide as the H-block thickness; wherein the connecting slots of each base black and each H-block allow for receipt and interconnection of the base block or H-block with an associated base block or H-block forming a notched connection for the base blocks and H-blocks; wherein at least the main blocks include an inking pattern using plant based environmentally friendly inks; and wherein the shipping box is an integral component configured to be integrated into structures formed by the set.

A structure for coupling assembly blocks of a polyhedral shape formed of a plurality of side plates, a top plate, and a bottom plate, includes a first coupling member formed on a portion of at least one of the plurality of side plates, the top plate, and the bottom plate and a second coupling member formed on a portion of at least one of the plurality of side plates, the top plate, and the bottom plate other than one on which the first coupling member is formed. The first coupling member of one assembly block is configured to couple with the second coupling member of other assembly block in a sliding manner, in a fitting manner, or in a rotating manner.

A structure for coupling assembly blocks of a polyhedral shape formed of a plurality of side plates, a top plate, and a bottom plate, includes a first coupling member formed on a portion of at least one of the plurality of side plates, the top plate, and the bottom plate and a second coupling member formed on a portion of at least one of the plurality of side plates, the top plate, and the bottom plate other than one on which the first coupling member is formed. The first coupling member of one assembly block is configured to couple with the second coupling member of other assembly block in a sliding manner, in a fitting manner, or in a rotating manner.

A building component for building structures, the building component configured to be releasable connectable to a second conjugate building component. The building component comprises a frame being a section of a basic geometrical shape. The frame having at least one side; the side having at least a protrusion. The conjugate building component being of the same structure also has a frame having at least one conjugate side; the conjugate side having at least a corresponding conjugate receptacle. When the building component and the conjugate building component are connected the sides of building components are next to each other. The protrusion and receptacle of the components snugly engage each other so that the inner and outer surfaces of the protrusion and receptacle are in contact with each other. The friction between the surfaces prevents the disconnecting of the components.

A brick (2) for the plug connection in a plug connection system in a space spanned by a longitudinal direction (4), a transverse direction (6) transverse to the longitudinal direction (4) and a height direction (8) transverse to the longitudinal direction (4) and transverse to the transverse direction (6), including: a first brick part (10) having an interior space (14) which is bounded by a wall (16) in the longitudinal direction (4) and the transverse direction (6) on both sides and in the height direction (8) on the top side (17), the first brick part (10) having a first plug connection element (18) on the top side (17). a second brick part (12) having an interior space (26) which is bounded by a wall (28) in the longitudinal direction (4).

A modular construction kit includes modular construction blocks, each includes at least one interface face. The interface face includes a recess, a plurality of connection apertures disposed proximate to the edge of the recess, and a circular interface receptacle disposed in the center of the recess. The kit also includes modular construction connectors, each includes two opposite sides, wherein each side including a body, a plurality of connection studs extending outwardly from the body, and a protrusion extending outwardly from the body. Some modular construction blocks include predetermined functions. A modular system block includes at least a processor, storage, and wireless communication.

In an aspect, a kit is provided for constructing a craft, and includes a plurality of blocks. Each block has a main body having an exterior surface that is made from a material that is adherent when exposed to water so as to permit the blocks to adhere to one another. Each block further includes a top surface and a block projection extending from the top surface. Each block further includes a bottom aperture extending into the main body towards the top surface, and defining a longitudinal axis. The bottom aperture includes a first aperture region that is shaped to receive the block projection of the second block of the plurality of blocks. The bottom aperture includes a second aperture region that is shaped to receive a distal portion of a block tray projection on a block tray.

An object having a plurality of negative curvatures comprising a plurality of planar sections adjoined together by locking segments.

A learning-based building block system is described. The learning-based building block system comprises at least two stackable blocks. The at least two stackable blocks may include: a first stackable block having a cube configuration, a second stackable building block having a sprocket configuration, a third stackable building block having a half-pipe configuration, and a fourth stackable building block having a table configuration. The configuration of each of the first, the second, the third, and the fourth stackable block is unique.