The student constructed various 3D shapes using toothpicks and marshmallows based on clues, building a cube with 6 faces, 12 edges and 8 vertices; a square pyramid with 4 faces, 12 edges and 8 vertices; and a pentagonal prism with 7 faces, 15 edges and 10 vertices. The activity helped them learn more about representing 3D shapes and connecting marshmallow vertices with toothpick edges, while also sparking questions about constructing a 20-sided shape.