I do this with third grade, so a much younger crowd. I put sticky notes up down our hallway, from my classroom to our library (so winding through the school). My white board is humans, and about halfway around my classroom is dinosaurs, right outside my room are the first shelled animals, first single celled animals, etc…then walking really, really far to get to the potential meteor crash 3 billion years ago, and finally the creation of Earth about 4.5 billion years ago when we reach the library. They realize what a tiny part of geologic time contained humans.