In his essay “Lightning and Series – Event and Thunder,” originally written around 2003 and published in English in 2006, German media philosopher Friedrich Kittler writes: “Strangely enough, there are signals that exist in all mathematical purity, such as on the one hand the sinus tones that have lasted for eternities and that will continue to sound for eternities, and on the other hand signals like the Dirac Impulse, whose large but finite energy discharges itself in an infinitely short time. Between these two extremes our life is made up, in the words of Sophocles, of ‘mere phantoms, shadows of nothing.’” In this half hour, I want to share with you some thoughts and raise some questions regarding one of these two signals, namely the “sinus tones that have lasted for eternities and that will continue to sound for eternities.” In other words, I will be talking about sine waves.