The Grand Builder Set

The Grand Builder Set is our ultimate architectural building collection, thoughtfully curated for children who love to build, create, and imagine without limits. Combining the Rêve House, Fynn Set, Busy Blocks, and Cosmic Cubes, this premium open-ended building system inspires everything from neighborhoods and castles to expansive cityscapes and imaginative worlds. The removable translucent acrylic building blocks and shimmering Cosmic Cubes add light, color, and sensory exploration to every creation while encouraging creativity, spatial reasoning, fine motor development, problem-solving, and early STEM learning. Beautifully crafted to grow with your child, this heirloom-quality collection saves $50 compared to purchasing each set individually and includes free U.S. shipping.