Looking for the threads, I found a mention of this in the Photo Albums:
https://www.quiltingboard.com/member...bums16942.html
There are some more threads, but this one had the link to the album and some good finishes:
https://www.quiltingboard.com/member...bums16942.html
In vintage quilts I have seen a knife edge, where each small hex is preserved. Crazy stuff!