Whedon believes parents label their children as "indigo" to provide an alternative explanation for their children's improper behavior stemming from ADD and ADHD
"There are more things in heaven and Earth, Horatio, than are dreamt of in your philosophy. - Hamlet, William Shakespeare
“I believe in everything until it's disproved. So I believe in fairies, the myths, dragons. It all exists, even if it's in your mind. Who's to say that dreams and nightmares aren't as real as the here and now?”
― John Lennon
Boasting a skill that Chinese researchers had These ancient myths, derived from the first ... of the millennium, have set the ence Symposium on the Extraordinary
-- the CIA
https://www.cia.gov/library/readingroom/docs/CIA-RDP96-00792R000300420017-1.pdf
Indigo children
https://www.wikiwand.com/en/Indigo_children