Look for patterns in the bridge design. List the characteristics of the bridge or walkway. Compare and contrast the characteristics of your bridge to these other bridges. Look for reasons for the differences. Make a list.
Bridges tend to be symmetrical.
Have students explore the meanings of symmetrical and asymmetrical. Principal Activities Plan activities in which students explore the relationship between symmetry and visual balance. Set up design problems for students to solve in small groups. For example, tell one group that a new road is being built and it must cross a ravine near their community. The ravine is between their community and an historical cathedral, so residents will not want the bridge to block their view of the spires.