Fractal tray puzzles are based upon space filling fractal curves. The pattern is a single line that crosses all of the two-dimensional space without ever repeating. The puzzles follow these simple rules to break the line into multiple pieces that are almost identical but are actually unique. The pieces are so similar in style that once they are placed into the puzzle it is hard to see where the pieces are. The puzzles can be tricky to solve even if you have the solution on hand.
The Dragon Curve: first investigated by NASA physicists John Heighway, Bruce Banks, and William Harter. It's rounded flowing pattern and nearly identical pieces make it the hardest of the three puzzles.
This puzzle has 17 unique pieces
The puzzle is 200x200mm in size, the pieces are 3mm thick and the whole puzzle is 6mm thick.