I used to assign colours to all the numbers when I was a kid. Perhaps this stemmed from a Sesame Street/Playschool obsession. 1 was always yellow, 2 was red, 3 was blue, 4 was green, 5 was orange, 6 was purple, 7 was pale green, 8 was black, 9 was indigo and 10 was rainbow. It took me a long time to grow out of this, and I think I still secretly do this!
A childhood belief about classes

others believed things like this
- I used to believe that if you mixed red, blue, green, and yellow paint you'd get plaid!— Judith Ann
- I used to believe that God was the Incredible Hulk - he was green and muscly and had purple trousers.— Emma
- When I was younger, I used to think that barney was a giant purple and green puppy!Anon
- Eifel 65 - Blue
I'm Blue (if I was green I would die...)
[I'm blue, da ba dee, da ba di.]— Matt - I used to believe the sky was green and everybody was colorblind since they said it was blue— IM COW
- i used to believe that red yellow and green meant "ready, set, Go!" on traffic lights..— cabagona