(Of course, this isn't any serious question.)

I used to walk to my job along a small park area. It is not fenced off, but there are these strange teeth-like posts around it to keep out cars in the rush hours. I liked to watch the plants and how they changed, knowing I'd spend the rest of the day inside.

The sun had not risen high, and the shadows of the posts were long and stark on the lawn on that morning in late October; the air was still crisp, there was a nip in it, even though it promised to be a warm day.

What colour were the shadows?