This one is everyone's favorite. There is a petition the make it a new graduation requirement.  This handmade puzzle completes as a map of Somerville Neighborhoods.  For those of you who do not get out or your comfort neighborhood as often as you like, at least pretend you like the rest of Somerville.  Leave the puzzle on your coffee table in its mysterious burlap bag, and make visitors wonder what is inside.  Or leave it out in pieces, temping those who truly know their city to put it together.  For $50 you can get the deluxe edition, with a frame and city seal, ready for display.