This takes a little while, the image is double sided, with the reflection and the double sided, one has four of everything to sort out. I started putting together the wide black and white wedge shaped stripe and then working outwards. For some reason the reflection is not perfect, which can help. Half the time the piece one is searching for is upside down. One works areas of puzzles and then fits the areas together. Several times to fit areas together one section had to be flipped over and spun 180 degrees.
I was about 80% done and I had 4 pieces left all sky blue. I turned them over and each had a pattern and was able to use the pattern on the reverse to fit the 4 pieces together. Then flip the 4 pieces over and they can only fit in one place. A person smarter than I am could use this to an advantage.
I think I am of average Artifact abilities, I needed five hours working alone to finish this puzzle. Maybe the most fun I've had for five hours in some time. This puzzle is a favorite, one puzzle friend boxed it up and borrowed it as soon as I finished. Another couple I share puzzles with will not let it in their house.