A little research reveals - Audaciously Embedded (in spite of my better judgement) by Alison Davies..... Made of recycled fabric including shirts and boxer shorts. Machine pieced, hand quilted. Amazing!!
I think each hex triangle starts out with 2 different rectangles, sewed corner to corner (like HST), then trimmed to a 60 degree triangle - still working on figuring this out, but website has some clues