Define visible and invisible movements.

The movements which can be observed by eyes or we can also say those movements which are visible to eyes are called 'Visible movements ' . Some examples of visible movements are movement of hand , movement of leg etc.
However , Invisible movements are those movements which could not be observed by naked eyes or we can also say that the movements which are not visible to naked eyes are called 'Invisible movements ' . For example the movement of brain .
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