Freedom in a cage

I Know why the cagebird once sunghe sung becuase he was happyhe thought he was freeand in a since he washe was  freed to a cagewith rusted towers for barsthat threw shadowsmasked as oppurtunitesthat stared down throug a glass ceilingthat says the sky is the limitbut due to his oprressionhis limit was the skyso he sung and sungand till this day he still asks a riddled questionARE WE REALLY FREE