I found a very interesting lesson plan focussed on, well, just what it says in the title. What a great way to hook the students. I think a great way to lead into this lesson or mini-unit would be to have some kaleidoscopes for the children to play with, because let’s face it, everyone digs kaleidoscopes–they’re just that cool! While they are looking through the kaleidoscopes, ask them what they see. Do you see any specific shapes. You could ask them to imagine a line cutting their view in half so that there is a right and left hand side. Do they see any similarities between the two sides. I think 3 to 4 questions of this nature would be sufficient for creating student buy-in before moving into the objective and lesson.
Please check it out! http://www.ms.uky.edu/algebracubed/lessons/Symmetry_in_Kaleidoscope_Designs.pdf. Let me know what you think.