Size and Color: The "Size" means the quantity of the log stones; The "Color" means the material of the log stones. NOVEL STACKING TOY: Unlike the traditional building blocks, every block is a polyhedron, each different in size, color and weight, making stacking game more challenging so that kids can complete the building process in a whole new way SKILL DEVELOPING: The stone blocks have many flat cut surfaces so the stones can be stacked and kids can stack different shapes of stones to the highest. Unlike regular building blocks, this wooden stone balancing and stacking game is a better way to stimulate a child's sense of challenge and develop their hands-on skills, promote creativity, resilience and persistence and to strengthen fine motor skills, visual-spatial skills, color recognition and thus training logical thinking. PERFECT FAMILY GAME: When kids enjoy it on their own, it is a great toy to improve their patience and develop independent thinking and logical reasoning skills. When children and parents are engrossed in the game together, it becomes a great interactive game that promotes their bonding. Also, this delightful stacking toy can be used as a unique home dcor item to add a touch of romance to the house. BEST GIFT OPTION: The toy has lots of fun to keep your kids engrossed for hours! It is perfect for all occasions: parties, birthdays, holidays, Christmas and more. It can be played with by more than one kids, thus increasing interaction between them.