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Sine Wave A 440 Hz Concert Pitch for Ten Hours
Stop your brain from overthinking. You don't need an app. Ten hour Sine wave with no overtones which is called pure as it is only the fundamental frequency.
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Damián Ortega’s Controller of the Universe (2007) is a frozen explosion of hand tools hovering in an almost dreamlike state. These saws, planes, and axes suggest alternative ways to look at tools, in the hope that the experience will transform the visitor’s own ideas about what tools are and mean. Tools can destroy as easily as they can help construct.