New in package 1. STACKING: HEXACUS pieces are easy to hold and the unique hexagonal cross section and size progression from large to small allows for a variety of ways to stack the pieces. 2. NESTING: When a smaller HEXACUS piece, or pieces, can fit inside a larger HEXACUS piece, it's called nesting. Discover all the ways HEXACUS pieces can nest. 3. PATTERN MAKING: It's fun to place HEXACUS pieces side by side on a flat surface and create colorful patterns. Includes Idea Booklet and 12 hexagonal pieces in different sizes: 3 red, 3 orange, 2 yellow, 2 green, 1 light blue, 1 dark blue.