We notice how virtually all of the farmland has changed to an urban setting. Highways have filled in from various directions, and it's easy to imagine the increase in traffic. If you look at these pictures, you will notice white spots where many of the modern buildings have been added through the years.
Next it was time to construct the remaining two D's. A poster in the puzzle box shows pictures of the plastic buildings that are included with the puzzle. I used the poster to install the buildings in the order that they were constructed in the city. In this way, not only was height added to the puzzle, but also that fourth dimension of time.
We could see Boston's development through time. The 4D puzzle was fun to put together, but it felt different than puzzles I've worked in the past. It makes a nice display to help with studies of Boston, Massachusetts, and just makes me want to visit the historic city even more than before. Here is the site of the Boston Massacre, the Boston Tea Party, and the Battle of Bunker Hill. Here is the major site in the conception of the United States.