Squint

I remember decorating the tree when I was much younger. Mom taught me her trick for checking to see if the lights were done right. She said, "Sit across the room, squint, and look at the tree. That's how you find any bare spots."

This tree's peak doesn't have lights because there is a long skirt on the angel at the top. So, I'd say the squint test shows that this tree is pretty well-lighted. Hmm, except for that one bare spot near the top.