The visible touchable manifestations of God in old testament are generally thought to be Jesus Christ. He either appears as the angel of the Lord or word of the Lord. It's says no one has ever seen God only the son in the book of John.
Essentially you have invisible ever present God and Devine manifestion yet they are basically the same thing. It's the whole reason why it makes more sense to use the general title lord than the personal identification of jehovah.
Once you understand what new testament writers are referencing what statements like " he is the visible image of the invisible god" or " Jesus is the perfect representation of the father"......it's just makes it kind of hard to take the watchtower very serious.
Once I started to understand the idea of Jesus in the old testament, I had to stop attending. This very subject woke me up to how stupid wts theology.