If screen technology could go far beyond retina scale DPI, yet is constrained by the limits of what the human eye can discern, this concept would be great for discrete read-only user interfaces. e.g. put it on a mechanical watch to retain style and tradition, whilst also delivering feeds, alerts à la smart-watch.
That is neat. I had no idea that microdots had a history before they were used by spies. I thought that grainless film, where the photosensitive component is at the molecular level, wasn't developed until 1930. But the old collodion process used was grainless, although really slow, as in light-insensitive. As a process for making original photographs it was barely usable, but this is using it to make prints, for which light sensitivity is no problem.
