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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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Joji Koyama is a filmmaker, animator and graphic artist. His short films, animations and music videos (including Four Tet, Mogwai and Jlin) have screened internationally, winning awards at the London Short Film Festival and British Animation Awards. In 2015 he began Toupée, a small publishing imprint, and published his first book of short visual stories, Plassein. This was followed by Elsewhere, an illustrated colouring book published by Penguin Books. In 2017 his first feature length film Kuro, written and directed with Tujiko Noriko premiered at the Slamdance Film Festival.