Philo of Byzantium called it a ploughed field "above the heads of those who walk between the columns below"
Thus it happens that a ploughed field lies above the heads of 
those who... [DOC] [TLE] Examinations of the Practicality of Objectivism & Other Writings ... [PAR] Aug 25, 2008 ... Clue: Philo of Byzantium called it a ploughed field "above the heads of those who 
walk between the columns below."