I came across this one on Netflix streaming movies. It is narrated very pleasantly by Forrest Whitaker.
I am both a Scientist and a long-time amateur photographer. I have at one time or the other been curious about each of the short subjects presented here.
"Unseen" is used broadly, not just for the invisible or tiny. For example, by use of very high frame rate photography we are shown things like how a bullet shatters an object, or how a drop of water reacts and bounces multiple times when it hits a pool of water. Things that we see, but happen so fast that we can't really tell what is happening.
Or the opposite, slow frame rates, or time-lapse photography. By this technique we see flower blooms opening, seeds germinating, vines growing and climbing.
And then there is the true microscopic world of creatures so tiny they can only be discerned with high power microscopes, even the ultra high power electron microscope.
A very interesting short film that comes in just under 40 minutes.