The diagonals of the faces have a ratio of 1.618 (golden ratio), and the edges of the faces are the same length (rhombic). Twenty faces. They are both wonderful to look at and to hold. Some are difficult to disassemble and all are difficult to assemble. As with Wayne's triangle based puzzles, it is difficult to visualize when you are making progress. Wayne used a computer program which identified over 6,000 possible designs. Many would not assemble or would fall apart. The six shown vary in difficulty. One of my favorite puzzles. His other golden rhombic puzzle is the Golden Rhombic Triacontahedron.