PicassoTiles PTB116 hedgehog shape building blocks offer easy connectivity and simple to disconnect to maximize fun and build more creative designs. PicassoToys PTB116 hedgehog shape building blocks enables children to improve hand-eye coordination, gain a strong sense of color, counting, sorting, attention, promotes the child's brain development, and focus by using their hands to foster Science, Technology, Engineering, Art and Mathematic STEM STEAM skills.