Abstract: Most children's construction sets fail when to comes to providing children with a fast and easy way to build large structures, such as houses and forts. They fail because the methods they use to connect the pieces of the set are not feasible, don't enable the children to build large structure, or quickly damage the pieces themselves. This application represents years of refinement to produce a novel “turn-key” design that makes it very easy for children to build such structures—or any other large objects they can imagine. The novelty of this approach includes a slotted “Connecting Element” that users can slip between cutout made in the edges of “Planar Elements.” The user inserts the Connecting Element, lines up the slots on the element with the edges of two adjacent Planar Elements, and then rotates the Connecting Element approximately 90 degrees to connect said Planar Elements using friction and compression.