Museum Staff in the Dynamics of Evolution Exhibit, by Unknown, May 1979, Smithsonian Archives - History Div, The "Dynamics of Evolution," exhibit in the Smithsonian's National Museum of Natural History seen from above. A group of Smithsonian staff members pose for a photograph in the "Dynamics of Evolution" exhibition next to the "People Tower" and the "Dog Tower. The "People Tower" is covered with more than 100 larger than life-size photos of faces showing genetic traits, such as blue or brown eyes, or black or blond hair. The "Dog Tower" illustrates how "artificial" selection by human beings has influenced an animal's evolutionary history..