Our main state university had an open day as part of a national "Science Week". They had a bunch of Leica stereo dissecting scopes set up on benches with random aquatic plants, bugs and other stuff in small dishes, that looked like it was something that you just pull out of your local creek. People could come in and just take a look.

It was incredible. Zooming in on some of the plants, it was like there was a entire world in there that was completely invisible to the human eye.

It reminded me of Feynman's quote/lecture about there being "plenty of room at the bottom". It put it into perspective about just how much room there really was.