Dynamics of Evolution exhibit at NMNH, 1979, May 1979, Smithsonian Archives - History Div, Photograph of the "Dynamics of Evolution," a major exhibit at the National Museum of Natural History. The "People Tower" in the foreground is covered with more than 100 larger-than-life sized photos of faces that show genetic traits, such as blue or brown eyes, or black or blonde hair. Also there is a "Dog Tower" which illustrates how "artificial" selection by human beings has influenced an animal's evolutionary history. Other labels can be seen explaining evolution-related topics such as "Natural Selection" and "Differentiation." The Dynamics of Evolution exhibit opened to the public on May 18, 1979, and was the first exhibit in any American museum to explain the basic steps of evolution..