Found a stone caving while hiking. (this is very interesting.)

I saw this last night.

First time I saw the post, it looked like the symbols were carved into the surface, like indented.

I just now realized this is a relief.

Weird.

Edit: wait a second…

This is like the dress…

Yanny vs laurel.

Brainstorm and green needle.

I can switch it between relief and indented at will.

It’s an optical illusion.

The shadow on the triangle is what makes it look like a relief.