This video (showing a EM reconstruction of a 6um cube of rat hippocampus) completely changed how I think about the brain when I first saw it a few years ago.

It's all a jumbled mess of spaghetti, not a bunch of circles connected by lines as those pesky theorists would you believe.

https://youtu.be/Xhfnp2ZS0I8 

 @e298e1ac oh come on, the theorists were thinking about this since the 50s at least. 😉

https://neuromatch.social/system/media_attachments/files/111/132/131/881/355/180/original/f441d98dcc3385fd.jpeg