English: This is an ambigram by Douglas Hofstadter. Names of the 7 rainbow colors (RED, ORANGE, YELLOW, GREEN, BLUE, INDIGO, VIOLET) and a complex perceptual shift ambigram "2006" / "Doug", fusion of his signature and the date. Mirror symmetry (vertical axis).
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{{Information |Description={{en|1=This is an amigram by Douglas Hofstadter}} |Source=Douglas Hofstadter |Author=Douglas Hofstadter |Date=2001 |Permission={{PD-author|Douglas Hofstadter}} |other_versions= }} <!--{{ImageUpload|full}}-->