I did not live at the same time as they did, nor have I in person heard their voices or seen their faces. Yet I know it because of what is written on the bamboo and silk that has been handed down to posterity, what is engraved on metal and stone, and what is inscribed on bowls and basins.--From The Mozi--
People pick and choose among iPads and Kindles, iPods and Zunes to store and view their media, but they rarely think about permanence when making these decisions. Will their grandchildren go through their old files, like they might old books or magazines? Chances are, the devices will be useless blocks by then; the information stored on them lost because of mechanical failure, or unable to be transferred due to DRM restrictions.
I know the thoughts someone who lived over 2,000 years ago, but this thought I'm expressing in this sentence, will probably be unavailable to anyone in twenty years. It certainly doesn't deserve preservation, but I have to wonder about the things that do. Will they vanish in the same way?