 In the simple case, one could create a halftone using the same techniques used for printing shades of grey, but in this case the different printing colors have to remain physically close to each other to fool the eye into thinking they are a single color.To do this the industry has standardized on a set of known angles, which result in the dots forming into small circles or rosettes.The dots cannot easily be seen by the naked eye, but can be discerned through a microscope or a magnifying glass.