And some historical and modern eye candy, from the world of fastback seat stays:
Early Carlton 'Victor' seat cluster, with seat stays attached behind, instead of on the two sides of seat tube. This cluster was introduced around 1965, used on Carlton B.M.B Racing Team bikes, and available on consumer frames in late 60s Carlton catalogs.
The drool worthy fastback connection on the 1970s Raleigh Professional (1976 catalog):
Ron Cooper's monostay seat connection (1997 frame):
Fastback connection on a Formilgi custom steel frame:
