Water Surface Printing

Another old link here you might already have seen a few months back and it passed me by, but now it seems theres a device which can ‘print’ on the surface of water by producing and controlling a series of small waves and ripples.

Not sure what the point is, but I’d certainly like to actually see it in action close up, and maybe have a go a spelling out words (remember your first calculator at school! 5318008)