How to explain polarized light?

Polage Double Miniature: art with polarized light using polarizing sheets and birefringent cellophane to create changing forms and colors. A polarizing filter is used to reveal the colorful designs- amazingly with two images hidden within these layers. Rotation of the polarizing filter also allows the artist to produce colorful metamorphosis in these images. These affordable sun catchers are made in limited quantities by @austinestudios, and look amazing through polarized sunglasses as well. Lig