I forgot I was going to ask a question. . .

Have any of you seen electricity above or around an object (regardless of temperature) appearing somewhat like a heat wave - a shimmering effect?

During the last six months or so, (even during the winter) I have seen shimmering waves around the metal frame of our trampoline, and around barbed wire fences, etc... I also think I can see it around the trunk of our ponderosa trees. If I gaze past the edge of the object, the closest 1/8th inch seems to move and flow.