Why does the sky turn blue during the day and red at sunset? The atmosphere scatters blue light more than other colors. You can model this effect with clear glue sticks and a small flashlight. Shine a flashlight into one end of a glue stick. The end near the light glows blue. The far end glows yellow-orange. Tape more glue sticks together to lengthen the path. The colors shift further toward red as the light travels farther. Add polarizing filters to see another property of scattered light. Rotate a filter between the flashlight and glue stick. One viewer sees a bright beam while another sees a dim one. This shows that scattering also polarizes light.