Isolated material particles are abstractions, their properties being definable and observable only through their interaction with other systems .
Niels Bohr, Leon Rosenfeld (1985). “Collected works”
![Isolated material particles are abstractions, their properties being definable and observable only through their interaction with other systems .](http://cdn.quoteddaily.com/images/niels-bohr/isolated-material-particles-are-abstractions-their-properties-being-definable-and-observable-only-through-their-interaction-with-other-systems-.jpg)
Isolated material particles are abstractions, their properties being definable and observable only through their interaction with other systems .