First I had students look at the pictures to identify what they saw and how they were all the same. Then I introduced the term "bilateral symmetry" to them. They had already been doing some work with symmetry in math, but I found that they had a hard time describing what it means to have symmetry. Most who responded referred to a "line down the middle" but were unable to go far beyond that in their definitions so I drew a butterfly and talked about it being the same on both sides. Then we looked at the prefix "bi" which they eventually realized meant "two" when I had them compare the number of wheels on tricycles and bicycles. l didn't spend too much time on this introduction, but I wanted them to understand that they were going to start this drawing in the center and then build out symmetrically on both sides of the center, making sure that each subsequent pair of buildings would be exactly alike. I drew a very quick example, stressing the importance of making them the same size, shape, color, etc. I also showed them one that I had done, and explained that they should not color in the windows, as we wanted them to be created using negative space, which I defined as "the parts you don't color" -- leaving a more detailed explanation for another time.
I made sure students knew that it was ok for their buildings not to extend across the entire length of the paper, and to take their time. During the last ten minutes of class, I had them do a "turn and talk" activity with a partner, in which they told their partner which part of their drawing they especially liked, which part they might change if they were doing it again, and how they knew they had used bilateral symmetry. Finally, I had them tell their partners what they liked about their partners' drawings.
Because I teach several hundred students each week at three different schools, I can't display everyone's art work, but these were so awesome that I created a "strip" of them in each of my three classrooms, using the work of about fifteen or so students. I love the way they create the look of one long, nighttime cityscape.

This activity was very successful on many levels. Every piece of work produced was original and had its own personality, and the students were very engaged with their drawings. And the best thing of all is that when they finished this art work, most of the students were more clear on the concept of symmetry, and that it's not the line, but what's on each side of the line that counts, and could explain the concept to me or to a partner.
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