I have seen almost this phenomenon: Some people are able to reduce a very complex problem and its solution down to something so simple that upon hearing it, eve

I have seen almost this phenomenon: Some people are able to reduce a very complex problem and its solution down to something so simple that upon hearing it, everyone is immediately convinced of its truth. In fact, it is so self-evident and cannot be seen any other way, that you do not even feel the need to write it down. It may even be dismissed by some as being too trivial an observation to be of much help. ...And then, just a few days later, you find yourself staring at this very problem and all its immense complexity starts looking menacingly at you. Solutions? Ha! how could one possibly even hope to solve such a problem! Except, you recall that someone did. And yet, for the life of you, you wish you could remember what that solution was. Only then can you appreciate its elegance and the genius required to produce it.