Here's an example showing how complex systems
are composed of small building blocks.
The loudspeaker is connected to a ground, the only one of its kind
in order for there to be a complete circuit, there must be another
ground of the same type. The truth is there are many such grounds
but they are not visible, because they're inside the building blocks.
Here's an example showing what's inside two of the resonant circuit
building blocks. The first one has inside two kinds of grounds, the
input has an earth ground, and a signal input from the antenna.
The second one uses a common system ground for both input, and output.
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