(Preliminary note : The reflection on the phenomenon of temporality that I am developing here was originally done with the playing of actual sound samples. Reading the written exposition without the actual sound and trying to compensate with merely imagined examples would make the exercise too abstract; for imagination is always, even if inadvertently, selective, following what one already knows or expects. Imagined samples are not charged with the kind of resistance to or controverting of presupposed features that "a thing itself' can possess. It is recommended, therefore, that one try to display to oneself actual sound samples like the ones indicated in order to present" the phenomenon itself' that is being examined. This goes as well for the shift in the kind of phenomena presented that enters as the analysis proceeds, the shift from samples of sound to one of light.)