Well I wouldn't use the term 'building' even though that's what it says on the diagram. This is the result of several iterations of translation - probably Japanese --> Chinese --> English or maybe even Japanese --> English --> Chinese --> English.
I wouldn't use the term 'cartoon' either since the diagrams aren't humorous or political and they won't be used to create a fresco. In any case either connection will result in a negative voltage at pin 3 for much of the potentiometer rotation.
Don