If there are no things, then there's nothing to interact with, and so no interactions.

The colour of the leaves in your backyard doesn't depend on your eye, only your perception of the colour does. The colour of the leaves depends on the spectrum of light incident on them, and the reflectivity of the leaves across that spectrum. The reflectivity is based on chemistry and ultimately physics of the atoms in the leaves. So the colour of the leaves is an *emergent property* resulting from the *relation* between the incident light and the atoms in the leaves.

Once the light reflected from the leaves enters your eye, there's another set of interactions between the light, your retina, the rods and cones in it, your optic nerve, your visual cortex, etc and so on.

Atoms have particles, which have quarks, which may or may not have other things inside 'em. But things there are.

Yes, Virginia, there are still things. They just might be different from the things you think you see. Yet without those things, you wouldn't see anything - indeed, there would be no "you".