As a member
Holograms are reconstructions of stored information using 2 lasers in the simplest of terms. The waves regardless of type are recorded and later reproduced. Unless the good folks of pre 1947 history using their esoteric skills made and stored holograms we are likely out of luck on that front
Not sure where the echo comes in?
That aside; history is speeding up? Are you saying the past is now accelerating faster then the present? I do not accept simple speculation with no empirical support to base it on. Sorry.
Lots of good points and idea's One thing no-one has mentioned is early Persian rugs expert. You would be surprised at some of the common images/symbolisium to the mamuk cards.