The Same Color Illusion . ... 17.07.2007 . ... The above illusion , called the same color illusion , illustrates that purely human observations in science may be ambiguous or inaccurate. Even such a seemingly direct perception as relative color. ... The advent of automated, reproducible, measuring devices such as CCDs have made science in general and astronomy in particular less prone to, but not free of, human-biased illusions . ... NASA Web Site Statements, Warnings, and Disclaimers . ...