Ah I see. Sorry I missed that there is a English page (actually linked to from the link referenced above). While having fewer problems than the original page it

Ah I see. Sorry I missed that there is a English page (actually linked to from the link referenced above). While having fewer problems than the original page it may give you a better flavor than Google Translate (and shows how far Google translate still has to go :-): https://en.wikipedia.org/wiki/Jade_Mirror_of_the_Four_Unknowns https://en.wikipedia.org/wiki/Jade_Mirror_of_the_Four_Unknow...