Humans couldn't "see" blue until modern times?

[dickman69]

me n my budz always call it "keg jumping" but only b/c we have a friend nicknamed keg & he would jump like that often while playing frisbee

now it is used literally anytime that that happens

& no one around us has any idea what were talking about & theyre probably much less prone to noticing the keg jumps in the 1st place tbh

[hubb]

all about stuff like that