a rightly timed pause

“… the data from which these images are created are not visual but numerical, and that you and I could never “see” the Cat’s Eye Nebula the way its photo shows it, even if a rocket could somehow propel us to its near neighborhood some 3,000 light-years away. Why? Because the radiation emitted by the nebula and given visual expression in the photographic print is substantially outside the boundaries of human sight.”