A few weeks ago, while I was in York by myself (Mom's day off!), I met an interesting man named Trevor Morris, originally from Wales, who does amazing photography that shows the phosphorescence of certain minerals. If I understand it correctly, he takes the photos in the first few milliseconds after turning off the light in a room -- he built his own device that does this-- and the camera captures what the human eye can't see. BBC did an article about him some years ago. And here's a link to a slideshow of some of his photos. Pretty cool!
American readers might notice the references to "NY" on the website. That's North Yorkshire, not New York! :)