Contrary to wishful thinking, the moment of creation is not the moment that an author or artist conceives an idea about something. Ideas are not protectable as property under law. Persons harboring ideas can agree to keep them confidential among themselves, which, of course, does nothing to prevent another person from having and using the same idea. (The same applies, generally, to inventors, regarding ideas.)

The moment of creation that is recognized and protected under copyright law is the moment that the "work of authorship" is created "in tangible form." That is, when the work has been written down, chiseled in stone, or otherwise recorded in some way, so that someone is able to read it, look at it, or listen to it, directly or with the aid of some kind of machine, then the copyright exists. It's the tangible expression of the idea, not the idea behind the expression, in which one may claim copyrights.