There's probably a name for these little round pool in tidal rock shelves. This one from near my home was one of the nicest I've seen. Challenge is to stand directly over but avoiding adding my shadow, and being alert to the ocasional larger wave heading my way.

[Tonytee]

Nice, very nice. A great example of patterns in Nature. Many thanks for posting.

tt

[mahanpots]

It's difficult to make out what this is, but I want to see more.

[cymric]

Great shot. Looks like a chameleon eye to me

[SimplyCreativePhotography]

I've never seen one of those before. Very interesting. Thanks for sharing.

[ProfessorBuzz]

Looks like an ancient inlaid sunflower. I've never seen something like this. More please!

[othar]

Well worth the trouble of photographing. Very aesthetic.

[saley]

Nice, very nice. A great example of patterns in Nature. Many thanks for posting.

tt

Thanks.

---------- Post added 05-02-21 at 04:43 PM ----------

It's difficult to make out what this is, but I want to see more.

It's a hole in the rock shelf, presumably the result of tidal flows, and a bunch of molluscs calls it home. It's about 4 inches deep, 8 inches across. It and retains the water when the tide recedes. The dark centre, the 'pupil' is a small bit of seaweed firmly attached to the rock.

---------- Post added 05-02-21 at 04:45 PM ----------

Looks like an ancient inlaid sunflower. I've never seen something like this. More please!

Thanks. I found this when I decided to photograph all the little boat sheds around our village. There are big sandstone rock shelves between the beaches, and wave action has led to interesting shapes and patterns.

---------- Post added 05-02-21 at 04:47 PM ----------

Great shot. Looks like a chameleon eye to me

Unless I find a technical name I think chameleon eye will suffice - thanks for the idea

[Geodude]

It appears to be some sort of pot hole that formed in or around an ancient stream bed before the sediment was indurated in to what appears to be sandstone. It may have been formed by a small boulder that fell off a cliff into the stream. The pot hole appears to be near or within an intertidal zone close to a beach, as I see barnacles, pelecypods (oyster shells) and maybe a brown sponge of some sort near the center. What's odd are the radial fractures emanating from the center. It may have been a hardened mud at the time the boulder struck it, resulting in these stress fractures. Perhaps you can find a local geologist who might be able to "dig" deeper into this interesting anomaly.

[saley]

Well worth the trouble of photographing. Very aesthetic.

thank you