I absolutely *loved* coming across this NASA Standards Graphics Manual from 1976 @SFMOMA—clean design standards & space travel might be two of my favorite things 
pic.twitter.com/kIP5ft8NI5
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“The marking of NASA space vehicles is essential, critical, and difficult. It is quite important that any identification or marking be consistent with the overall goals of the NASA Visual Communications System.”
“Of course, the overriding consideration is that markings not interfere or impede the scientific mission of the craft.” <= 
... and of course, “Helvetic Medium is the typeface used on the spacecraft.” 
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