Hi @synesius,
I know what you mean, but there’s no such thing as an “object” in the Suttas. The words that are used to mean this in later Abhidhamma texts don’t mean the same thing in the suttas. For the Buddha, all experience is interdependent. That means there is no such thing as “object”. What can “object” mean, if not “things that exist objectively, independent of the observing mind”?
But rūpa, like everything else in the suttas, is never spoken of in this way. Instead, consciousness arises in the conjunction (tinnaṁ saṅgati phasso) of the inner and outer sense fields. It’s a subtle point, but it changes a lot about how you look at meditation.