The Sea of Glass and the Tabernacle of the Testimony

We read again of the “sea of glass” in Revelation 15:2…

^“And I saw, as it were, a sea of glass mixed with fire, and those who had come off victorious from the beast and from his image and from the number of his name, standing on the sea of glass, holding harps of God.”

In this case the “sea” is no longer described as a “crystal,” but as “a sea of glass mixed with fire.” Where John had seen the sea in front of the throne, here we see the overcomers “standing upon the sea of glass.”