(I would like to preface this post with an advance apology for its mildly technical content. Those with an intense physical aversion to science may elect to skip today’s text entirely and go straight to the pretty pictures. No offense taken.)
Just beyond the spectrum of light visible to the human eye lies near infrared light. And though we can’t see it, the silicon-based sensors of many modern digital cameras can. By using a filter which blocks all visible light, you can get pictures that offer a wonderfully surreal view of the world. Foliage and clouds, which reflect infrared light, look ghostly and white, while sky and objects that don’t, go very dark. This is different than far infrared (thermal) photography, which registers heat.
Okay, science is over. Thanks for hanging in there.