No glue or connectors required...simply stack the precision-milled, solid pine KEVA planks to create buildings, monuments and geometric forms. Its the ideal activity to help kids gain an understanding of balance and proportion, as well as an interest in architecture, building and design. Structures is an architectural building set that requires no glue or connectors! Simply stack the precision pine planks to create ornate buildings, monuments & geometric forms. Helps kids gain an understanding of balance, proportion, architecture, building & design. Details:Natural wood color200 pieces24-page, full-color idea booklet with build-out instructionsAges 5 and up