I remember some years ago being amazed when IBM managed to rendered
their name dot-matrix style by aligning single atoms into position.
Humans seem to have have a compulsion to write on every imaginable
surface and with every imaginalbe tool. Is it a compulsion to write,
or a compulsion to communicate? I wonder...

Like the atoms, this one was a step or two beyond my imagination:


http://www.engadget.com/2006/07/25/researchers-using-waves-to-write-on-water/


Or is this really new? Maybe its just a new fangled watermark ;-)