LOL! But I can see how it might appear to be a sperm, as well as most of the things that have been mentioned. Yes, very interesting indeed! Uh huh! Now here's a clue to blow your minds... You mostly say it's something microscopic or intangible. Nope! It's close to life size I'm guessing. It's not the complete object, but a big part of it. More clues after more guesses, if necessary.
A moths eye called ommatidia,made up of thousands of lenses that can detect movement and light with an antireflective layer so as not to give it's position away.
I just realized I didn't follow the rules since it's not a closeup and I didn't take the image. But it's a fun one cause it could be so many things. My first thought was that it looked like a celestial body. Like a star. But that wouldn't follow the thread rules, unless I had a powerful telescope.
A bad case off blue tongue, that requires "URGENT MEDICAL ATTENTION ", with anti-inflammatory and antibiotics and isolate the patient ASAP.