Here the round arches of the triforium have been built up, and the clearstorey harmonizes with the more elaborate scheme of the choir.
"Bell's Cathedrals: The Cathedral Church of Ripon" by Cecil Walter Charles Hallett
Given the overlapping properties of FR Is and FR IIs, and of BL Lacs and quasars, it seems likely there is one over-arching “grand uniﬁcation” scheme relating all radio galaxies to all blazars, although we still do not know what this scheme is.
Issues in Blazar Research
Bressan, A., “The unique limit of the Glimm scheme.”, Arch.
Local and global existence theorems for the Einstein equations