Three “animal” drawings, all photographed from Tektronix video displays.
A The earliest version of the „animal“ drawings in African bushman style, with core figure visible. (left image up)
B The second version of the „animal“ drawings in European paleolithic style, core figure still visible. (left image down)
C The final version of the „animal“ drawings, the core figure invisible, a head added.(right image)

(Source: McCorduck 1991:93)