Movies, pictures, audio recordings capturing a moment in time - a documentation of history. I just listened to a 30 minute recording of a Christmas reunion of the Wells and Wisners in 1966. Taped on a reel to reel Sony Tapecorder TC-200. It was fun to hear everyone's voices.
The changing technology can quickly obsolete the recordings. How many reels, 5 1/4 floppys, cassette tapes etc. are collecting dust with no hope of review or playback. The Egyptians recorded on rock - not a bad strategy for preservation and playback.Egyptians - the earliest bloggers.