How do you take a picture without using a camera? Normal cameras use a lens to form an image on a rectangular array of light sensitive detectors. An alternative approach, called "computational ghost imaging" uses instead a data projector and a single detector to form an image of the object through data inversion. This ghost imaging technique is certainly strange and clever, but is it useful? Normal cameras work well with visible light, but getting images in the ultra violet or infrared can be hard. By contrast data projectors can be made working over a whole range of wavelengths, far removed from the visible spectrum. Perhaps we can use this ghost imaging approach to make camera-like systems working over a much wider fraction of the electromagnetic spectrum.