I continue impatiently waiting for a large format true color electronic paper display at a quasi-reasonable price. I have had a different project idea for such a thing for several years now, but the wait continues. I imagine such a display would be excellent for the use described in this article. No need to mess about with matching light levels (although doing that was super cool!), battery would only need charged every few weeks or months, etc. There are actually a couple products that seem to be what I want, but for reasons I do not understand the image displayed can not be changed. I have no idea why someone would buy electronic paper signage whose image has to be provided to the manufacturer and which can not be changed later. I would expect a simple printed sign would be superior for any use that would be put to.