I can not understand what kind of technique in architecture?

Question

Design

Here, for such a question, they can laugh at me and take me for a fool, but honestly, I don’t know who else and where to ask.
I saw one “work of art”, which is a series of steles, looking at which you can’t see anything directly, a stella is like a stella, but when you look at the horizon line from a different angle, you can see text, drawings, outlines of something. Something similar can be seen in the works of Marco Cianfanelli , many will understand what it is about, remembering his one of the most famous monuments to Nelson Mandela .
I understand that I am in the wrong place, but programmers are still not ordinary average people, but people with a broad outlook and knowledge in many areas. Google hasn't been able to help me for a week now. I hope the administration will treat with understanding and publish the question.

Answer 1

Me... And what did you see?!