EDIT - dugmartin explained it better below ... Maybe, something similar to hearing, a person who is closer is louder while the one far is faint.... So nearby p

EDIT - dugmartin explained it better below ... Maybe, something similar to hearing, a person who is closer is louder while the one far is faint.... So nearby people have a stronger font while the one who is far has a lighter font ? Note - I've not used this app, so don't know how it is working ...