Revelation 4:2-6 NIV
At once I was in the Spirit, and there before me was a throne in heaven with someone sitting on it. And the one who sat there had the appearance of jasper and ruby. A rainbow that shone like an emerald encircled the throne. 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. 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. 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.
NIV: New International Version