Sign language also has other complexities. I don't know about american sign language, but german sign language (which I learned, I wouldn't say speak) is very d

Sign language also has other complexities. I don't know about american sign language, but german sign language (which I learned, I wouldn't say speak) is very depending on context and direction. For example, meanings can differ depending on what you are looking at. It is not "just recognition", it is "parsing the whole scene within context".