I realised some years ago that I associate colours with particular letters. I don’t know how common this is amongst people with Aspergers or whether it is even related. Some colour-letter associations are stronger for me than others:

• A is always bright red. The following letters then graduate through orange to yellow.
• M and letters around it are blue.
• O, P and Q are purple.
• S and T are green. R doesn’t have a strong association.
• U is brown.
• V through Z start mid-grey and get darker.

If I see one of those letters in a different colour it feels wrong and makes me uncomfortable. Strangely, I don’t have any similar associations for numbers or words. I wonder whether other Aspies experience anything similar?