A building block includes a block body of an integrated structure. The block body includes a main body, first splicing portions, second splicing portions, a first raised portion, and two second raised portions. The main body is elongated and horizontally extends from left to right. The first splicing portions horizontally extend outwards from one end of the main body. The second splicing portions obliquely extend forward or backward from a middle position of an upper surface of the main body. An outer side surface of the first raised portion recesses to form first splicing grooves tightly docked with and fixed with first splicing portions or second splicing portions of another building block. Two ends of an upper surface of the main body extend upwards to form the two second raised portions. An upper surface of each of the second raised portions recesses to form second splicing grooves.

Components may be used to build a three-dimensional (3-D) model. The components can include supports and connectors. A subset of components can be selected based on the 3-D model. The subset of components can be used to build the 3-D model.

A stackable block, comprising: a wall having an inner surface and an outer surface, the wall comprising a strip of material having a first end and a second end with a plurality of transverse fold lines spaced there between, the wall configured to define a structure having an upper perimeter and a lower perimeter, wherein the structure is formed by the strip being folded about the transverse fold lines and the first and second ends being connected together, and wherein at least a portion of the inner surface is vertically offset from the outer surface such that the upper and lower perimeter have stepped configurations.

Circuit blocks are provided. A circuit block may include a substrate and at least one electrical component mounted on the substrate. The circuit block may also include a non-conductive frame coupled to the substrate, and at least one post coupled to the substrate and extending from the substrate and through at least a portion of the frame in a first direction substantially perpendicular to the major surface of the substrate. Moreover, the circuit block may include a contact coupled to a second, opposite surface of the substrate and including a corner section projecting outwardly from the frame and extending in at least two directions substantially perpendicular to a longitudinal axis of the at least one post. The block may also include at least one magnet positioned proximate the flexible corner section of the contact and configured to magnetically attract at least one other circuit block.

A transformable building block comprises a body configured to receive a connector post or other portion of another building element, an appendage movably coupled to the body, and a post configured to protrude from the body and retract into the body. Inserting a connector post into the body of the transformable building block may cause the appendage to move and the post to protrude from the body. Removing the connector post from the body may cause the post to retract into the body.

Circuit blocks are provided. A circuit block may include a substrate and at least one electrical component mounted on the substrate. The circuit block may also include a non-conductive frame coupled to the substrate, and at least one post coupled to the substrate and extending from the substrate and through at least a portion of the frame in a first direction substantially perpendicular to the major surface of the substrate. Moreover, the circuit block may include a contact coupled to a second, opposite surface of the substrate and including a corner section projecting outwardly from the frame and extending in at least two directions substantially perpendicular to a longitudinal axis of the at least one post. The block may also include at least one magnet positioned proximate the flexible corner section of the contact and configured to magnetically attract at least one other circuit block.

A modular playing block system is provided. The block system comprises at least one storage container. The at least one storage container is has a hole. The block system also comprises a plurality of connectors, wherein each of the plurality of connectors is inserted in a hole of the plurality of holes to form different arrangements, and each of the plurality of connectors act as a support for the arrangements.

A construction toy system including a plurality of modular assembly pieces and a plurality of pivotal-rods. Each of the pivotal-rods includes an identical engaging rod-tips on each end thereof. Each of the assembly pieces have identical thickness and a circumferential edge. A number of straight receiving grooves are formed, inwardly, at the circumferential edge, wherein the identical thickness is predesigned to fittingly fill the gap formed by the straight receiving groove. A select assembly piece is configured to interlock with another assembly piece via the straight receiving grooves of both selected assembly pieces. A selected assembly pieces may have at least one identical circular through hole formed at a central location with respect to the lateral dimension of the assembly pieces, wherein an engaging rod-tip of a selected pivotal-rod may engage with a selected circular through hole of the selected assembly piece.

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.

A set of interlocking blocks consists a plurality of first blocks and a plurality of second blocks capable of forming kinematic interlock. Each of the first blocks and second blocks comprise at least one male joint and female joint for mating with its counterpart. The motion of the first blocks and second blocks are constrained by joints. Subsequent first blocks and/or second blocks reinforce and immobilize prior first blocks and/or second blocks. Assembly of an interlock structure consisting the set of interlocking blocks may be performed via translation motions.