Okay, okay!

I can't explain the phenomenon. One possibility for the form of a heart could be the surface tension of the liquid oil in order to the surface form of the picture. But how could I be able to explain it without seeing it and without any deeper knowledge about chemical or physical things?

I could explain you some frequency effects or maybe some electrical or digital effects but that's all.

The way you believe is your personally choice. Each human has its own sight for the world and so, each human has its own interpretation of believing. By the way, that's also a wunderful miracle...

As long as they are peaceful to another it's really a wunderful gift!