Build the Foundations of Mathematics Knowledge. Our versatile Pattern Play blocks are a great introduction to math concepts like sorting, matching, symmetry, congruence and fractions. This high-quality set fits just-so into its wood tray, with vibrant colors and unusual shapes that build spatial skills. Includes 40 exceptionally well-finished wood blocks, a 10.5"-square wood building tray, 40 Pattern Cards and a drawstring canvas storage bag.