All the ambiguity of body language with none of the advantages of context. I'm not the first and surely not the last person to confuse crying-tears-of-mirth

All the ambiguity of body language with none of the advantages of context. I'm not the first and surely not the last person to confuse crying-tears-of-mirth with crying-tears-of-sadness. And what am I to make of an aubergine or a bicycle?