It's a musical. Hence the reference to Psalm 137.
John really harped on his point here. It starts out kind of like a marquise banner:
Revelation 14
1 And I looked, and, lo, a Lamb stood on the mount Sion, and with him an hundred forty and four thousand, having his Father's name written in their foreheads.
2 And I heard a voice from heaven, as the voice of many waters, and as the voice of a great thunder: and I heard the voice of harpers harping with their harps:
I was just on the subject of marquise cut diamonds yesterday, which is why they came to mind, the details in the number of cuts etc.
Compare a convex lens; it's like viewing one from the side.
The idea here is that the quest for truth involves being on the lookout for different viewing angles -- new perspectives on reality, which are nothing like fill-in-the-blank games of fantasy.
The daily habit of personal observation and interest in the Creator's handiwork is nothing like making stuff up.
Even those faithfully sticking with the status quo settled "truths" will be shocked that they've been completely scammed by deadbeats masquerading as enlightened teachers of God's Word.
That's because they put their faith in somebody else's eyeballs. Turns out they were blind.