30 X-pieces and a booklet – hidden in a small box (right). 30 X form an icosidodecahedron – Leonardo Da Vinci’s favorite polyhedron, which has 30 vertices and consists of 12 pentagons and 20 triangles. Designer and inventor – Roger von Oech – is a well-known specialist in the field of creative thinking 🙂
![X-Ball X-Ball](https://buildkitpedia.com/wp-content/uploads/2023/07/Xball1.jpg)