colour-by-number (10. 376)

Among the first detailed satellite views of an extraterrestrial planet came in the form of telemetric data from the Mariner IV probe as it passed over the surface of Mars, but absent a technique to quickly encode and render that information as a picture—for a public eager to confirm or be disabused of the prospect of Little Green Men—mission engineers plotted the imaging data on a grid and buying a set of pastels from a nearby arts and crafts shop (told that their desired shaded chalk was for hardware stores), in preternaturally accurate tones of sienna, umber and buff, and filled in the landscape nearly instantaneously from the point of view of the awaiting, at-home audience—something we take for granted today. More to see from Kottke at the link above.