戴盆望天　

◎ 戴盆望天 dàipén-wàngtiān

[work blindly;try to discover the mystery of the sky by covering the head with a tub] 頭戴盆子而想看天上。比喻行動跟目的相反,愿望無法實現(xiàn)(語出司馬遷《報任安書》)

戴盆望天,不見星辰。——《易林·小過之蠱》