I found this more difficult than expected. I had a look at tree sihouettes, but did not see suitable ones, and going out in the half dark, for a better opportunity, is not recommended. Our local Common can be a bit iffy, especially in the (half) dark.
Almost from the start I had 'tunnel vision,' first trying to shoot people on tunnel like forest paths, against the lighter 'end' of the green tunnel. Couldn't get it right, so I decided to go to a real, pedestrian, tunnel, where I thought it should be possible to catch people coming through.
To my delight, I found a group of youngsters applying their graffiti art on the tunnel walls! Plenty of silhouettes if they'd let me.
Well, they did let me and I got at least a dozen shots, but it was difficult to get a real black silhouette and I did not want to blacken it by software.
Did get one and here it is:
