The Ball of Whacks consists of 30 magnetic design blocks that can be rearranged into many, many shapes. The inventor of Ball of Whacks, Roger Oech, uses the term "whack" to connote something that stimulates us to think differently--to break us out of habitual thought patterns.  Each piece is a "golden ratio" rhombic pyramid held in place by 180 rare earth magnets.  These pyramids fit together to form a perfect 30-sided rhombic triacontahedron, considered to be a masterpiece of mathematics.  Includes 96-page guide book.  Extremely popular with visual thinkers, ages 8+