Super proofs, I wonder if any labs still do them. They were fairly common at the lab I worked at. They were done there in one of the mural cameras, a horizontal unit with a 10x10 glass carrier. Never saw any 2 1/4 film proofed that way, I would think that's because a normal contact sheet would be large enough for the art directors to see. They were neat to look at, the super proofs that is, not the art directors.