Vertical and horizontal lines are an element of Mondrian's art symbolized harmony between opposites.
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Many scales are diatonic including Major, Minor (the Harmonic minor is an exception) and modal scales. Examples of non-diatonic scale are pentatonic, octatonic and whole-tone scales.
The classical principle of contrapposto, or weight shift, was reintroduced into western art by the sculpture Donatello
Answer: its pretty much voluntary the second a piece is created. But you can register with the US copy right office for the legal purposes.
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