... Activity 2: Demonstrating Light Pollution and Shielding . ... Many of us live in a world of urban constellations, unable to see the stellar constellations a moderately dark sky would provide. ... Birds can be disoriented by artificial lights at night. ... With a couple mini light flashlights and a PVC cap, you can illustrate the effects of lighting on our view of the night sky and how simple shielding fixtures can reduce light pollution while at the same time making the lighting more effective. ...