"It’s an interpretation, not a transliteration. We are not taking one word and replacing it with one sign. If someone asks for an egg, there is a specific sign for that. But if you talk about abstract concepts, like freedom, it can be expressed in many ways. The sign for that would be affected by the context."

Jeff Williamson, who is one of several interpreters who will be stationed around the Mall to translate the ceremony’s speeches and musical acts into American Sign Language.