Virtual things that emerge from interaction and exist as interaction According to this comment:


  "Form is like a lump of foam ... And consciousness like an illusion" (SN 22.95)
  means something more subtle and interesting, much more deep than just
  "empty of self". It means that these things are "virtual" (in the
  original sense of the word) - they emerge from interaction and only
  exist as interaction, they only seem solid "from inside" but in
  actuality they are like sleight of hand.


I guess this comes from one of the Mahayana schools' interpretation of Madhyamaka shunyata (emptiness).

What does this really mean?

Let's say I have a piece of apple in my hand. I see that it's an apple. I feel that it's an apple when I touch it. I can smell it as an apple. It also tastes like an apple when I bite into it.

How does the apple emerge only from interaction?

How does the apple exist only as interaction?

How is the apple like a sleight of hand that only appears solid, although it's virtual?

I originally thought this is related to physics, where things that we can experience are made of atoms which are mostly empty space. However, Buddhism is almost always related to the mind. So, how does this apply to the mind?

Does this interpretation come from Yogachara?
You only really know of the apples existence by touching it, smelling it and tasting it.  That is, interacting with it. Even looking at it is an interaction.