[Serious] The love of a God

[Neo-Scholastic]

...where the figure and ground reverse and I see the absence as a thing all its own.

Do these triangles "exist?"

The fact that you asked about triangles and not, say circles or butterflies, suggests there is something immaterially present in those figures with the power of efficient cause. In this case, they caused the subject of your question to be "triangles". How can something that doesn't exist prompt you make comment about it?*

*I think this is an interesting question in its own wright. It has a question-begging kind of quality and yet I believe it still has value for teasing out notions about categories of being and various questions about realism. I would also say that this has interest to me as an oil painter because depictive painting relies entirely on illusion for both effect and affect. Can a practice, like representational art, based entirely on deception still "capture" truth? What is the nature of such hidden truths revealed only by illusion?