Trying to work with in the set of someone else's possible solution. As a way of trying a different perspective.
In my line of interest as well as in mathematics there is always a question of what someone was thinking at the time they were working on a project. Every one knows that Wernher von Braun wanted to go into space. But in the mid 1970s another name came to my list that of Kelly Johnson. There was different reasons for some of the things that he had used and that I was picking. Were his reasons mine was he planning ahead. The search for what he could have been thinking of trying offers a chance at a different perspective. In this case his options as of 1960. Some of my books were from that period so a survey of what he could have believe was possible. (There is not a 100% solution there.) My answer did not come from this but part of my growth did. One has to believe in the intellegence of others. Scott Crossfield made a proposely to boost a X-15 into space. Using standard rockets but that would be a step backwards.