The fourth at Baltusrol was originally designed by Tillinghast with a pond but the green did not front the pond. In preperation for the 1954 open RTJ redesigned the 4th and placed the green right beyond the water with a stone wall. I do believe that the stone wall was perhaps the piece of this hole that is most copied in a sense, whether it be stone, rock or wood. Anyway, there's the famous story that the members considered the re-designed 4th to be too difficult. Jones went down to the 4th tee with amall group of them, teed it up and lo and behold aced it! Turned to the members and said something to the effect that there was obviously nothing to the hole. Again, I suspect there were par 3's before 1954 with water up to the edge of the green, but i don't know if there were any with walls.
Cliff