Or is it something falling? There are barely perceptible streaks running up the upper left-hand corner of the image at about a 45 degree angle to the central image.
Are you reading a Highlights Hidden Picture list, @matwoolf? Yes, organic, no, not a flock of bats. And the streaks are there and relevant, but it's not something falling and I don't know how you can possibly see them.
My laptop has a retina screen. If you're on a laptop, tilt the screen toward you some and the streaks become very clear.
Ah, ok. Funny I didn't get that. I have to clean similar webs with similar little carcass junk-piles strung along them from the balusters that ring my upstairs patio. As soon as I saw the image, all I could see was the remains of a hand with one digit too many. Completely illogical, I know, but once I saw it I could not unsee it.
Bingo. Amazingly a small spider builds a very large fake spider in the middle of the web like a scarecrow. Spider brains are mind boggling.
LOL—just back— it actually was my eyesight. As soon as I saw the larger pic, I recognised it for what it was. One of my friends sent a similar pic to my phone one day, his brain boggled as we'd been talking about self-awareness in animals. He couldn't get his head around the fact it could replicate what it looked like, only in much larger scale, right down to the appropriate number of legs.
After some frantic surfing, I now know that is a Triffid plant. I'm away to bed before someone posts another one and I end up half the night trying to figure it out.