The main character of the entire book of Revelation is the Lord Jesus Christ, in chapters 2 and 3 we saw the risen Lord from heaven addressing the churches on Earth. Now after chapter 4 the scenario changes completely, placing the readers in Heaven. The Apostle John sees a door open in heaven & a voice calls him “Come up here, and I will show you things which must take place after this.” He then sees a throne in heaven & heavenly worship.