This 4D Cityscape San Francisco Puzzle provides hours of enjoyment. This award-winning design recreates the famous skyline not only in three dimensions using scale-model buildings, but also along the fourth dimension of time. The 4D Cityscape time puzzle will take you back in history while you are creating it. It spans over 100 years of architectural history. This 4-D Cityscape puzzle comes with more than 1,100 pieces.It also includes a time poster chart and easy to read instructions. The 4-D Cityscape puzzle, USA is a beautiful masterpiece when finished. This item is suitable for children ages 8 years and older. Share the fun of putting it together with your family or independently by yourself. The 4D Cityscape San Francisco Puzzle is a work of art so that once you are finished you will want to leave it together.