A modular construction system, including, first and second walls, each having first and second broad surfaces. Each wall includes throughgoing connector-receiving bores. The modular construction system further includes a connector including a longitudinal body portion arranged along a longitudinal axis and having a first width. A head portion of the longitudinal body portion includes a base surface having a second width in a direction transverse to the longitudinal axis. A pair of protrusions extend outwardly from the longitudinal body portion and are disposed between the base surface and a tail end of the longitudinal body portion. The protrusions include an engagement surface facing toward the base surface and having a third width, the third width being greater than the first width.

A system comprising a plurality of blocks is disclosed. Each block has a cuboid body and a connecting member extending away from each corner of the cuboid body, such that for each connecting member there is a first opposed connecting member, a second opposed connecting member and a third opposed connecting member, and a connector engagement arrangement is defined between a connecting member and each of the first, second and third opposed connecting members. The system also comprises a plurality of connectors, each connector having a body with a first connection end for engagement with a connector engagement arrangement of a first block and a second connection end for engagement with a connection engagement arrangement of a second block so as to connect the first block to the second block.

A connection device and system is disclosed that is made up of a flexible grid and durable connectors for removable insertion into spaces of the grid.

The invention comprises a plurality of rectangular prism and/or cubic blocks. The sidewalls of the blocks comprise various combinations of grooves and/or pegs. Each groove extends along the respective sidewall within which it is disposed, from a corner wherein the top wall and the respective sidewall intersect to a corner wherein the bottom wall and the respective sidewall intersect. Each peg is configured to be slidably received into a groove disposed on another block within the plurality of blocks.

The invention comprises a plurality of rectangular prism and/or cubic blocks. The sidewalls of the blocks comprise various combinations of grooves and/or pegs. Each groove extends along the respective sidewall within which it is disposed, from a corner wherein the top wall and the respective sidewall intersect to a corner wherein the bottom wall and the respective sidewall intersect. Each peg is configured to be slidably received into a groove disposed on another block within the plurality of blocks.

An insert-and-twist building block structure includes a connection bar and a connection terminal unit. The connection bar has an end from which a combination projection section extends and has a conic shape. The combination projection section has an external circumferential surface formed with a bead ring including multiple raised beads intermittently arranged in a ring configuration. The connection terminal unit includes a connection terminal having an end inward recessed to form a combination cavity in a conic shape. The combination cavity has an internal circumferential surface formed with a groove ring including multiple recessed grooves intermittently arranged in a ring configuration. The recessed grooves each a middle portion forming a deep trough section and two ends each forming a shallow trough section, and a depth is decreased from the deep trough section toward the shallow trough sections.

A modular construction system, including, first and second walls, each having first and second broad surfaces. Each wall includes throughgoing connector-receiving bores. The modular construction system further includes a connector including a longitudinal body portion arranged along a longitudinal axis and having a first width. A head portion of the longitudinal body portion includes a base surface having a second width in a direction transverse to the longitudinal axis. A pair of protrusions extend outwardly from the longitudinal body portion and are disposed between the base surface and a tail end of the longitudinal body portion. The protrusions include an engagement surface facing toward the base surface and having a third width, the third width being greater than the first width.

A stack and nest toy is provided. The toy includes a plurality tube sections that each comprise a scaled variant of a matching shape such that a first of the plurality of tube sections is scaled to nest around a second of the plurality of tube sections. The second of the plurality of tube sections is scaled such that a respective outer surface of a bottom portion thereof is configured to interlock with a respective inner surface of a top portion of the first of the plurality of tube sections and, when the first of the plurality of tube sections is interlocked with the second one of the plurality of tube sections, an orientation of the first of the plurality of tube sections is rotationally different from an orientation of the second of the plurality of tube sections.

A toy brick system is provided having a plurality of bricks each of which has a post positioned extending from a first end of a body of the brick and having a socket at a second end. The post in each brick in the plurality is engageable with a socket of an adjacently place brick in a removable rotational engagement enabling curved and angled configuration of assembled structures. Engagement and disengagement from the rotational engagement can only occur at a specific engagement angle between adjacent bricks thereby maintaining the rotational engagement of adjacent bricks once engaged and rotated out of the engagement angle.

An educational apparatus is disclosed. The educational apparatus has one or more first sheet members including a first side and a second side, the first side and the second side each having first markings indicating the same first surface area, and one or more first attachment portions disposed along some or substantially all of a perimeter of the one or more first sheet members. The educational apparatus also has one or more second sheet members including a first side and a second side, the first side and the second side each having second markings indicating the same second surface area, and one or more second attachment portions disposed along some or substantially all of a perimeter of the one or more second sheet members.