a modular polyhedral object having at least four external faces which each have in the assembled state a different form and / or color design , is formed from several individual building blocks that each forms a part of the form or color design of each external face . the building blocks are joined together loosely or with releasable connecting means , wherein the building blocks of each module have at least four differently designed side faces . a form - congruent assembly of the object is created by arranging the individual building blocks so as to produce matching external faces on each side of the object , as well as to produce matching respective opposing side faces of the building blocks inside the object with vertically and horizontally matching coded pairs . a modular polyhedral cube - shaped object with at least five differently designed side faces is also described .