In this universe, no phenomenon is ever governed by just a single rule. Take the "falling water droplet" for instance—it involves air friction, water's surface tension, and more profound interactions such as intermolecular forces, gravity, and the three laws of mechanics, not to mention even deeper aspects like the "structure of fundamental particles," and "what imparts mass to matter."
So-called experiments are about minimizing the influence of certain laws as much as possible to highlight the workings of a single rule.
Whereas "thought experiments" are about conceiving a scenario in which all laws are in an idealized state, influencing the phenomenon minimally, whilst one specific rule's effect is infinitely emphasized.
Comparing heaven and earth to a dense and delicate web woven from "rules." How can one dance upon such a web using just one or a few rules? Upon threading the "line" from one level to the next, how can one avoid getting entangled with the level above?
