Communication time line

I wanted to put a photo manipulation together that showed communication over time and this is what has come together. There has obviously been many other forms of communication that are not covered by this, but I think I have covered a fair selection and a large bredth of time.

I would love to know what people think as I am still trying to get to grips with photomanip. Thanks for any favs and comments

Thanks to the following for stock images
Cave by at [link]
Cave painting by at [link]
Star skyscape by at [link]
Satellite by at [link]
Boy with laptop by at [link]
Iphone by at [link]
Typewriter by at [link]
Wood letters by at [link]
Binary coding by at [link]
Coptic tablet by at [link]
Latin script by at [link]
Horus Egyptian papyrus by at [link]
Stonehenge postcard by at [link]
Fire by at [link]
Morse code lettering by at [link]
Landscape by at [link]
Train by at [link]
Plane by at [link]
Pony Express statue by at [link]
Ship in harbour by at [link]