correction (arches/domes *vs spandrels*) are duals > > If we accept that contrivance or one like it, then the two types of > elements (arches/domes) are duals. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://redfish.com/pipermail/friam_redfish.com/attachments/20210314/a5da2fe1/attachment.html>