"How a form is seen by a person arises from the sources beyond the individual person - from the opinion of the general public or from the prevailing habit of thinking"
This is by far the most compelling piece in Fleck's theory and am not surprised you picked it up. It can be related to and associated with an answer to your question, how words are being formed. As a writer, they are times when certain words just pop into your head and seem to blend in your tenses, some of these words might not exist. You'd get surprise when you come across it somewhere else. In no time, the dictionary adopts it and it gets published in a new edition. An example of such recent words are Bromance, Chillax, etc.
You know, every man's invention and scientific break through all sprout from an idea, a single thought that might have seemed impossible at first. If they be a parallel universe (which I believe so), traveling there will only be a matter of time, and time as explained in Relativistic time idea derived from Albert Einstein's theory of Relativity.
I did a research on time travel not too long along and was amazed at the findings. Did you know there was a woman pictured answering a cellphone in one of Charlie Chaplin's videos back in 1928? From her dressing, I can say she's probably from our time. This goes to show that traveling in space and time will soon be or might have already been actualized but kept hidden from populace.