At a glance

Mack accelerated as soon as the light turned green and glanced side to side. Right, the Japanese restaurant has a banner up. Center, something white in the median, a paper bag--

Skull--

and on the left, on the other side of the road, a girl jogging. He looked back at the white thing. Looking directly at it, it looked like a crumpled paper bag, but he could still see the dark circles. He looked away, watching the spot from the corner of his eye. It was a skull, maybe human, humanoid at least, placed upright, facing east. There was something painted or worked into the brow, and half a dozen dark flat things, stones or metal, arranged in a circle around it. That was all he could see before he drove past. He didn't know what it was, whether it was a warning or boundary marker or offering or what. He kept going.