Falling pumpkin.

I spied this rotund arachnid while biking past a fence post.  It was descending fast, providing only a few seconds of photo potential.  And then it was gone, into the grass.

 

I read it as a zoological pumpkin, its descent indicating that fall is indeed here, and the unseasonably pleasant weather was about to end--which it promptly did. 

I don't know the species, although if you google "pumpkin spider," you get images of similar but different-looking spiders (Araneus diadematus).

I used to spend significant lengths of time online trying to identify unknown species.  That activity has lost its magic. So it's a pumpkin spider, even if not officially a Pumpkin Spider.