Indirect Worship
...although they are not expressly worshipped by them (as by the papists) by bowing the knee and burning incense to them or offering prayers, still they cannot be said to be free from all worship; if not direct, at least indirect and participative because they hold that by images and the sight of them they conceive holy thoughts concerning God and Christ (which cannot but belong to the worship of God, so that thus they really worship God by images).
Francis Turretin, Institutes of Elenctic Theology, ed. James T. Dennison Jr., trans. George Musgrave Giger, vol. 2 (Phillipsburg, NJ: P&R Publishing, 1992-1997), 64.