God shows John His throne before He shows him the future.
1 After this I looked, and there before me was a door standing open in heaven. And the voice I had first heard speaking to me like a trumpet said, “Come up here, and I will show you what must take place after this.” [1 Thessalonians 4:13-18] 2 At once I was in the Spirit, and there before me was a throne in heaven with someone sitting on it. 3 And the one who sat there had the appearance of jasper and ruby. A rainbow that shone like an emerald encircled the throne. 4 Surrounding the throne were twenty-four other thrones, and seated on them were twenty-four elders. They were dressed in white and had crowns of gold on their heads.
5 From the throne came flashes of lightning, rumblings and peals of thunder. In front of the throne, seven lamps were blazing. These are the seven spirits of God. 6 Also in front of the throne there was what looked like a sea of glass, clear as crystal. In the center, around the throne, were four living creatures, and they were covered with eyes, in front and in back. 7 The first living creature was like a lion, the second was like an ox, the third had a face like a man, the fourth was like a flying eagle. 8 Each of the four living creatures had six wings and was covered with eyes all around, even under its wings. [Ezekiel 1:5-25] Day and night they never stop saying: “‘Holy, holy, holy is the Lord God Almighty,’ who was, and is, and is to come.” [Isaiah 6:3 & John 12:41]
9 Whenever the living creatures give glory, honor and thanks to him who sits on the throne and who lives for ever and ever, 10 the twenty-four elders fall down before him who sits on the throne and worship him who lives for ever and ever. They lay their crowns before the throne and say: 11 “You are worthy, our Lord and God, to receive glory and honor and power, for you created all things, and by your will they were created and have their being.” [Revelation 5:13]