I must return to a line of thought I spoke of earlier regarding where our present notions of cyberspace are in relation to what I believe the future holds. Today we see cyberspace as primarily a place in which we are mirroring the world external to ourselves as individuals. I think not, yet this seems to be thought acceptable in cyberspace. It may be helpful to rephrase our question. Well, they certainly exist, but are known to change, fade, become buried and sometimes disappear completely over time.
Spoken words drift away after they are mouthed.
Some are committed to memory, some forgotten completely. I believe we've not yet seen much of this type of thing in cyberspace. An exception may be a particular view of a visual chart or graph that rearranges itself on command when we ask various questions of it, writing or displaying over itself as we continue to interact with it. Perhaps a page assembled according to an entered search query could also be thought of an ephemeral aspect in cyberspace. One observation that seems oddly ironic to me is that our ancestors spoke ephemerally for eons before they developed the means to write things down, but now we will witness an inverse order in the evolution of cyberspace.