This approach is described as a "passive" system because once initial conditions are set inside the flask, a continuing presence of helium and good insulation is all that is required to maintain those conditions.

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In complex systems, the slightest variation in initial conditions can create large deviations in future system conditions over time and not necessarily in predictable ways.

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The definition of a chaotic system I use is any system in which a tiny change in initial conditions can lead to a large change in results.

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Simply put, a chaotic system is one whose final state is extremely sensitive to the initial conditions: if you change the beginning a little, you change the end a lot.

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