There is no interface between consciousness and a world furnished with non-conscious objects, not because the two substances are of completely different kinds, so that only an object can affect another object and only something else already subjectivity can come to attention within a subjectivity. That way of posing the question is folksy but absurd. It is because there cannot be a witness to any such interaction, there is no position from which it could be validated. Any 'position' is either all one thing or all the other.