 These features are not claimed to obtain in all cases of interaction with some environment. It is a matter of detailed physical investigation to assess which systems exhibit which features, and how general the lessons are that we might learn from studying specific models. One should thus beware of common overgeneralisations. For instance, decoherence does not affect only and all ‘macroscopic systems’. It is true that middle-sized objects, say, on the Earth’s surface will be very effectively decohered by the air in the atmosphere, and this is an excellent example of decoherence at work. On the other hand, there are also very good examples of decoherence-like interactions affecting microscopic systems, such as in the interaction of \(\alpha\)-particles with the gas in a bubble chamber. (Note, however, that this also relies on the \(\alpha\)-particles being emitted in states that are superpositions of strongly outward directed wavepackets.) Further, there are arguably macroscopic systems for which interference effects are not suppressed. For instance, it has been shown to be possible to sufficiently shield SQUIDS (a type of superconducting devices) from decoherence for the purpose of observing superpositions of different macroscopic currents – contrary to what one had expected (see e.g. Leggett 1984, and esp. 2002, Section 5.4). Anglin, Paz and Zurek (1997) examine some less well-behaved models of environmental decoherence and provide a useful corrective as to its scope.