This beautiful medallion crazy quilt was featured in the March issue of Quilts Japan magazine in either 2003 or 2005--I've seen it credited to both years.
I do not know the name of the maker. If you do, please contact me as I'd love to be able to credit it correctly! The maker's tutor was Keiko Yoshida, who works in a style that's similar to Michiko Sonobe.
It generated a lot of discussion on Crazy Quilting International, a Yahoo group devoted to crazy quilting. Beginning with message #38814, Judy Grant posed a question about piecing this type of medallion. This is the picture that she posted on her blog and asked about.
Hideko Ishida, one of the leaders of CQI, translated some of the pages in the magazine and answered some of the questions that were asked by the various members of the group in message #38965. If you're interested, join the CQI group and follow that discussion!
If you'd like to see Judy's version of a medallion quilt, follow her progress here and here and here and here and here. I do not know if she's finished her quilt yet.
If you'd like to try making your own version of a medallion crazy quilt, here's an easy piecing diagram to help you get started. Breaking down the medallion into the shapes that are shown here makes a quilt like this much less intimidating to work on.