The cuckoo clock is like this. But in other cases, when some of the parts come together to form a whole, they interact and change each other. Chemical composition sometimes exhibits this kind of change. When two elements come together to bond, doing so affects the chemical properties of the constituents so that the whole has a very different set of properties. Both sodium and chlorine are dangerous and harmful, for instance, but when they are chemically bonded in a certain proportion, they form sodium chloride: common salt.
Hmm
