The Constructive Triangles with 5 Boxes (A093) is a complete set of the classic sensorial material that guides children, typically in the 4–6 age range, through the exploration of how triangles can be combined to form all other geometric figures. All five boxes — rectangular, triangular, large hexagonal, small hexagonal, and blue — are included, making this set suitable for classrooms building out a sensorial shelf from scratch or replacing a worn and incomplete collection. The full five-box set allows teachers to walk children through the complete progression of constructive triangle work without interruption or improvisation.