 Early phantograms were hand-drawn, and examples can be found in mathematical and technical drawing texts from the early 20th century onwards.A book dedicated to the subject of hand-drawn phantograms, "Constructing Anaglyph Images on Phantogram Perspective Charts", written by draftsman Raymond Nicyper, was published in 1979.More recently, phantograms created from photographs and computer-generated images have appeared, with photo manipulation computer software making the process of creating them easier and quicker.