I looked at this painting, strange symbols, I didn't figure out what they meant, like English letters but not like a word.
Viewing post in Teratomachine: grey loop comments
Thank you very much, I have found the hidden ending. Looking back, as you said, it requires some imagination. In fact, I was almost there because I thought of entering the code, but at that time I couldn't find the same symbol as in the painting. So I got stuck and kept playing again. I feel a bit foolish.