I was showing the kids the difference between a Concave lens and a convex lens. I was able to "shrink" the class with this concave lens.

Here the class is multiplied in a homemade Kaleidoscope (made of 3 plastic mirror strips taped together in a triangle).

These kindergarteners make a Rainbow in the Light class. I had made a spectrum from sunlight with a prism earlier so they would know the correct order of the colors. The children with brown, pink and black cards learned that their colors are not part of the spectrum.