I have these little mirrors way up in my oak trees. I've had them about three yrs. This past spring I added to them when the wind flipped some of them over the big branches and they no longer hung down in the breeze. They reflect balls of light around the garden, and also into the house, in early morning and the late afternoon. In the winter, when everything is pretty bland outside, those little balls of light look pretty jumping around the yard. I charged my Flip video so I could show you, but I'll have to wait till tomorrow. Too much going on here, and I missed the "window of opportunity."
They're just two little round mirrors glued together on each end of a long piece of monofilament (fishing line). Very simple.