Pop Art uses iconic people or cultural symbols which can be identified as exactly what they are. Abstract Expressionism is not identifiable as a specific things or object, because it is supposed to communicate feelings. Pop Art usually sends a specific message, whereas Abstract Expressionism is art that is up to interpretation.
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The theremin is considered to be the first electronic musical instrument ever made, a legendary machine. It is also the only instrument in the world that can be played without needing to be touched! The magnetic field is changed by the varying distances between the two hands.
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