Jerry often says that Slam Bradley was really the forerunner of Superman, because we turned it out with no restrictions, complete freedom to do what we wanted; the only problem was that we had a deadline.
Jerry picked up the technique of visualizing the story as a movie scenario; and whenever he gave me a script, I would see it as a screenplay. That was the technique that Jerry used, and I just picked it up.
In this drawing we just let our imagination run wild. We visualized Superman toys, games, and a radio show - that was before TV - and Superman movies. We even visualized Superman billboards. And it's all come true.
He was mostly leaping tall buildings in the beginning. There were cases where he would leap off a tall building or swoop down, and at that point he would look like he was flying, I suppose. It was just natural to draw him like that.
And I agreed the feeling of action as he was flying or jumping or leaping - a flowing cape would give it movement. It really helped, and it was very easy to draw.
Jerry and I always felt that the character was enjoying himself. He was having fun: he wasn't taking himself seriously. It was always a lark for him, as you can see in my early drawings.