Game piece in the form of a polyomino or polycube or similar, consisting of a number of blocks (5) that are put together in an orthogonal pattern, characterized in that the game piece (4) comprises at least two parts (6) that are each formed by a number of aforementioned blocks (5) connected together in a fixed way, whereby these parts (6) are slidably coupled with respect to one another in such a way that they enable a number of forms of game pieces (4) to be formed with the game piece (4) concerned.

An element having a holding mechanism, adapted for interacting with a functionally aligned holding mechanism of a similar element, and including a holding state and a released state. The holding mechanism in the holding state is engaged with the aligned holding mechanism of the similar element for holding the element positioned with respect to the similar element. The holding element in the released state is disengaged with the aligned holding mechanism. The element also includes a sensing mechanism for providing grab-detection, the grab-detection including detection of an action leading to a grip of the element, having a grip on the element, an action of releasing a grip of the element, and a combination thereof. The sensing mechanism is functionally coupled to the holding mechanism for upon the grab-detection actuating at least one of the functionally aligned holding mechanism between the holding state and the released state.

An interlinking assembly device for generating three-dimensional objects. The device includes a unit having a pair of wings and at least one loop. The wings have slots that can accept a wing from another unit. The at least one loop can also accept a wing from another device, allowing multiple rows to be linked and extend in three dimensions. A kit includes more than one unit and can include more than one embodiment of the unit.

An aid for teaching mathematical concepts looks like a multiplication table but has separable rows of numbers. In the first row, cardinal numbers 1-n are displayed and second-N rows have cardinal numbers 2-n displayed along side one edge on the face. The remainder of the rows have the multiplication products of the cardinal numbers on the first row and the cardinal numbers of the rest of the rows arranged at the intersections of the cardinal numbers at the top and along side the edge. The rows are separable so they may be arranged in a multiplicity of pairs of fractional equivalents.