- Johanne A. Loon's double-hemisphere antique world map with corner decorations depicting the 4 elements: * Fire - the rape of Persephone * Air - Zeus drawn across the sky in a chariot * Water - Poseidon * Earth - Demeter Crisp, clear color image printed on thin mahogany board.
- Interlocking pieces specially cut to stay "locked" and not pull apart when moved.
- Trefl puzzles carry the ISO 9001 rating for the highest standards, from their environmentally friendly raw materials to the final product.
