People usually think that sign language was artificially created to help the deaf people. This is of course very wrong, but tells a lot about how society perceives abledness. In this case we could even talk about being deaf is a disability, but that’s a topic for a other day.

Actually, sign language historically developed similarly to how spoken language developed. This means that even within one country, many different dialects are spoken. This can be easily seen for rather simple words - the word “Friday” for example can be vastly different in once city compared to the other.