The transition from the facts of experience to a fundamental law often requires an act of free creativity from our imagination, as well as an act of creation of concepts and relations; it would not be possible to replace this act with a necessary and conclusive method. The fact that a concept in the presence of experience, even if originated from experience, has a certain logical independence is appreciated by considering extra-scientific thought. The observation of the existence of similar objects has given rise to the notion of number, but has not created it. In fact, people in some cultures have not gone any further than an understanding of only the smallest of numbers.