Body as a Musical Instrument
The Chinese describe the body as a musical instrument, constantly resounding with the flow of Qi in the meridians, as a flute does with a breath of air.
Good health is the equivalent of a pure clear note from this instrument, and illness as discord, which can be corrected by stimulating different points or holes, thus altering the quality of the note.
These ideas of tuning (which nowadays we might also think of in relation to the engine of a car) and allied ideas of correct frequency, timing, and so on to ensure that things run well, are useful analogies for us in the modern world.
Interestingly it is not regarded as entirely coincidental that many of the theoretical principles of modern physics have a similar basis and 'world view' as acupuncture. Both are looking behind the scenes at the interaction of energies. Acupuncture may be old - but its principles are also very modern!