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A point going around a circle. That is the whole machine.
No wave yet. Just a dot, taking a walk that never ends.
Put a dot on the rim of a wheel. Spin the wheel. The dot goes around and around, always the same distance from the middle. That is all you need. Every wave you will meet in this picture is this walk, watched in a different way.
Hit Play. The circle does not change. Only the dot moves.