Abstract: The invention relates to spatial figures, figural arrangement or logical plaything for improving stereoscopic vision comprising bordering lattice plates (2) in a parallelepipedon form, wherein movable elements (1) being of nearly similar form to the enclosed space are accommodated. The number of the elements are one piece less than the elements having room in the available space. Movable elements (1) are distinguished by symbols, colours. Movable elements (1) are compressed while assembling and pressing flexibly to each other and the lattice plates (2). Movable elements (1) keep their spatial position against their weight. A coupling means is also disclosed for joining up angularly the flexible plates, which coupling consists of ribs (14) parallel with the plane of the plate (2) and perpendicular slots (12). These elements are arranged on the edges of the plates (2) and alternatingly can be snapped to each other.