Kameraflage is possible because digital cameras see a broader spectrum of light than human eyes. By rendering content in these wavelengths we are able to create displays that are invisible to the naked eye, yet can be seen when imaged with a digital camera.
So basically you can now wear a t-shirt with dirty words on it that will only be visible when someone takes a digital picture of you. Which is pretty brilliant - or so I thought. Let's just say my grandparents were less than impressed with the Kameraflage "Eat a Dong" t-shirt I mistakenly wore in our annual Christmas card photo.