The idea behind this mural is to show how we perceive ourselves. Many of the great artists believed that a self portrait shows the artist's mastery. The mural also shows the developmental stages of self perception. Many of the children that visit the Science playground (ages 0-6) are in the The Preschematic Stage of Art. Here is a site that explains more about this. For more about all stages and examples see this site.
This was a very successful mural. There were so many contributions that we had to redesign it half way through the month to allow more space for contributions.