Rare Items That Are Hard to Find

This afternoon I returned to visit the nearest beach, so this time I was just looking for some that I thought were unique, barely visible objects that would be very useful. From a distance of 2 meters you can't see it at all because it's really small, so this afternoon I'm specifically looking for small things, because I've seen big things so often.

Incidentally, I got what I wanted from before, such as shells which in my opinion are very unique, because inside there are several other animals that have turned into rock (hard), these things are very rare to find.

However, what made me very confused, the seaweed seeds that were stranded in the sand had something strange, why not, from the other side they looked like sea shells and when turned over they looked like plant seeds. A little weird but true.

Thank you, I hope this is useful and entertaining.