John has an open door to see into heaven, the place of God. He sees creatures, elders, crowns, rainbows, worship, thrones - and a throne. There is really only one throne that matters. And on that throne seats the one with all power, control, authority, love, and the only one worthy of worship. He is sovereign over all the events in this world, which is evidenced by Jesus opening the scrolls to work out His plan to be glorified forever.