I do like the artsy postmodern design of this Sequerra ribbon microphone prototype which I have posted from Seguerra's site and with what I hope would be his permission had I asked. The long ribbon can be seen front and center, placed squarely between two uplifted stanchions that look like little arms. Two curved pole pieces appear to define a gap and I can only assume that in the center is something of an acoustic chamber.
Here it is to gaze at, at least for now. I do not know Sequerra but understand the brand to be mostly very high quality audiophile gear. It is my understanding that this microphone has not been released, and don't know how many, if any, were built.