The relation between two similar phenomena might be very simple. They may be linked directly. For instance, A sound of a broken glass may be directly connected to a braking glass. But it can be connected in more complex way, for instance there may be some computer that create a breaking sound, whenever I see a breaking glass. Or this connection may be correct until some time, ans it may be wrong in some future time<ref>[http://www.amazon.com/Fact-Fiction-Forecast-Fourth-Edition/dp/0674290712 Goodman, N., & Putnam, H. (1983). Fact, Fiction, and Forecast, Fourth Edition (p. 160). Harvard University Press.]</ref>. The reason to chose the most simple connection is beacause the number of available solutions are infinite.There fore for reasons of effective storge, we will use the simplest solution, that describes '''all connections seenso far observed''', but we will try to constantly refute it, to see if it still holds.