How does a cloud chamber illustrate the difference between observing an effect and observing a subatomic particle?

In the philosophy of physics, a cloud chamber serves as a primary example of the distinction between observing an effect and observing a subatomic particle directly.

The device functions by using a supersaturated vapor that condenses into tiny liquid droplets when an energetic charged particle passes through it. What is directly observed is not the particle itself, but rather the "cloud track"—a visible trail of droplets created by the ionization of the vapor along the particle's path.123

This illustrates a fundamental challenge in particle physics: while these tracks provide compelling evidence that leads scientists to "hardly suspend disbelief" in the existence of small, charged objects, they remain indirect observations. In quantum mechanics, the nature of these entities is complex, often defying visualization in terms of everyday, concrete objects. Consequently, physicists rely on these observable effects to correlate experimental data with mathematical models, often setting aside deeper metaphysical questions about the "ultimate reality" of the particles themselves in favor of the predictive power of their theories.4