Logical plaything for improving spatial orientation and joint for coupling flexible plates

A logical plaything for improving stereoscopic vision comprising plastic lattice plates releasably joined together to confine a space, said space containing movable elements located displaceably inside said space, the number of said movable elements being one piece less than the elements having room in said space, and at least some of said movable elements having distinguishing symbols and/or colors, said lattice plates comprising joining elements arranged on the edge of the plates formed by bearing surfaces being in a median plane of the joining angle of two adjacent plates, said joining elements are ribs and slots arranged alternating on said bearing surfaces and said ribs have a first surface parallel with the plane of the plates and joining to the bearing surface, and have an inclined endface joining to said first surface, said slot comprising a second surface joining to the bearing surface and perpendicular to the plane of the plate, in joined position of two adjacent plates said second surface is in contact with said first surface, in joint position between said ribs and said slots joint to them there is an overlap, wherein said movable elements are provided with elastically compressible convex side surfaces and said movable elements have outer dimensions adapted to fit in compressed state into the space confined by said lattice plates.

A logical plaything for improving stereoscopic vision comprising lattice plates releasably joined together to confine a space, said space containing movable elements located displaceably inside said space, the number of said movable elements being one piece less than the elements having room in said space, and at least some of said movable elements having distinguishing symbols and/or colors,

• wherein said movable elements are provided with elastically compressible convex side surfaces and said movable elements have outer dimensions adapted to fit in compressed state into the space confined by said lattice plates and
• said movable elements consists of six pieces of identical flexible square plates, said flexible square plates comprising edge surfaces inclining at an angle of 45.degree., slots and ribs on said edge surfaces, wherein ribs of a first plate releasably engage facing slots of an adjoining second plate to perpendicularly join said first plate with said second plate.