art
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.
Youtube
OSGEMEOS born 1974 in São Paulo, Brazil, are graffiti and street artists who are identical twin brothers Otavio Pandolfo and Gustavo Pandolfo. OSGEMEOS started painting graffiti in 1987 and gradually became a main influence in the local scene, helping to define Brazil's style. Video produced by Ben Mor.