As a sentence 'fuguruma no fumi (books on a book cart) and chirizuka no chiri (the rubbish at dust heap) are not unsightly even though there are many or there is much' is seen in the chapter 72 of "Tsurezuregusa," some people say that fuguruma-yobi and chirizuka-kaio (the ghost king of the waste) were created based on the above-mentioned 'fuguruma no fumi' and 'chirizuka no chiri' respectively.
『徒然草』第72段に「多くて見苦しからぬは、文車の文、塵塚の塵」という一文があり、この「文車の文」から文車妖妃、「塵塚の塵」から塵塚怪王が創作されたとの説もある。