Curve Blocks invite open-ended play that develops spatial awareness as well as cognitive, language, mathematics, and problem solving skills. Using one cylinder and nine curve blocks, a child explores dimensionality, encountering differences in height, circumference, and diameter as she arranges nine curves to create three concentric circles around the center post. She learns about halves, thirds, and quarters as she constructs the rings. Curve Blocks also invite flights of fancy as the child mixes, matches, and rearranges blocks to suit her creative impulses. At the intersection of science and art, varying shades of green among the blocks raise awareness of differences within a color.